diff --git a/cs-cz/javascript.html.markdown b/cs-cz/javascript.html.markdown
index 944719ac..b622dd2b 100644
--- a/cs-cz/javascript.html.markdown
+++ b/cs-cz/javascript.html.markdown
@@ -595,9 +595,6 @@ pojednává o konceptech vysvětlených zde v mnohem větší hloubce. Tento ná
 pokrývá hlavně JavaScript sám o sobě. Pokud se chcete naučit, jak se používá
 na webových stránkách, začněte tím, že se podíváte na [DOM][3]
 
-[Learn Javascript by Example and with Challenges][4]
-je varianta tohoto návodu i s úkoly.
-
 [JavaScript Garden][5] je sbírka příkladů těch nejnepředvídatelnějších částí
 tohoto jazyka.
 
@@ -619,7 +616,6 @@ na stránkách Mozilla Developer Network.
 [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript
 [2]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
 [3]: https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core
-[4]: http://www.learneroo.com/modules/64/nodes/350
 [5]: https://shamansir.github.io/JavaScript-Garden/
 [6]: http://www.amazon.com/gp/product/0596805527/
 [7]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
diff --git a/de-de/java-de.html.markdown b/de-de/java-de.html.markdown
index 79cb55ed..c5bf0e69 100644
--- a/de-de/java-de.html.markdown
+++ b/de-de/java-de.html.markdown
@@ -481,10 +481,9 @@ Für tiefergreifende Fragen ist Google der beste Startpunkt.
 
 **Online Tutorials**
 
-* [Learneroo.com - Learn Java](http://www.learneroo.com)
-
 * [Codingbat.com](http://codingbat.com/java)
-
+* [Codewars - Java Katas](https://www.codewars.com/?language=java)
+* [University of Helsinki - Object-Oriented programming with Java](http://moocfi.github.io/courses/2013/programming-part-1/)
 
 **Bücher**:
 
diff --git a/de-de/ruby-de.html.markdown b/de-de/ruby-de.html.markdown
index b7b21512..a9bdba59 100644
--- a/de-de/ruby-de.html.markdown
+++ b/de-de/ruby-de.html.markdown
@@ -679,7 +679,6 @@ Something.new.qux #=> "qux"
 _(z.T. auf Englisch)_
 
 - [Offizielle Ruby Website](https://www.ruby-lang.org/de/)
-- [Learn Ruby by Example with Challenges](http://www.learneroo.com/modules/61/nodes/338) - Eine Variante dieses Dokuments mit in-Browser Challenges.
 - [RubyMonk](https://rubymonk.com/) - Lerne Ruby mit einer Reihe interaktiver Tutorials.
 - [Offizielle Dokumentation](http://ruby-doc.org/core)
 - [Ruby from other languages](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
diff --git a/el-gr/java-gr.html.markdown b/el-gr/java-gr.html.markdown
index e31a1c22..d3855f41 100644
--- a/el-gr/java-gr.html.markdown
+++ b/el-gr/java-gr.html.markdown
@@ -841,10 +841,11 @@ public class EnumTest {
 
 **Πρακτικές και Φροντιστήρια Online**
 
-* [Learneroo.com - Μάθε Java](http://www.learneroo.com)
-
 * [Codingbat.com](http://codingbat.com/java)
 
+* [Codewars - Java Katas](https://www.codewars.com/?language=java)
+
+* [University of Helsinki - Object-Oriented programming with Java](http://moocfi.github.io/courses/2013/programming-part-1/)
 
 **Βιβλία**:
 
diff --git a/es-es/javascript-es.html.markdown b/es-es/javascript-es.html.markdown
index 0435c83a..bc4d5d81 100644
--- a/es-es/javascript-es.html.markdown
+++ b/es-es/javascript-es.html.markdown
@@ -515,9 +515,6 @@ cubre muchos de los conceptos que vimos aquí pero a mayor detalle. Esta guía c
 el lenguaje JavaScript solo. Si quieres aprender a cómo usarlo en un ambiente web empieza aprendiendo
 sobre el [DOM](https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core)
 
-[Aprende JavaScript con ejemplos y retos](http://www.learneroo.com/modules/64/nodes/350) es una
-variante de esta guía pero con retos.
-
 [Jardín JavaScript](https://shamansir.github.io/JavaScript-Garden/) es una guía para todas las
 funciones y características contra-intuitivas del lenguaje.
 
diff --git a/es-es/ruby-es.html.markdown b/es-es/ruby-es.html.markdown
index 476ce332..37f84b99 100644
--- a/es-es/ruby-es.html.markdown
+++ b/es-es/ruby-es.html.markdown
@@ -565,8 +565,6 @@ Algo.new.qux # => 'qux'
 ```
 
 ## Recursos adicionales
-- [Aprende Ruby Mediante Ejemplo con Ejercicios](http://www.learneroo.com/modules/61/nodes/338) - Una variante de
-esta referencia con ejercicios en navegador.
 - [Documentación Oficial](http://www.ruby-doc.org/core-2.1.1/)
 - [Ruby desde otros lenguajes](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
 - [Programando Ruby](http://www.amazon.com/Programming-Ruby-1-9-2-0-Programmers/dp/1937785491/) - Una
diff --git a/fi-fi/ruby-fi.html.markdown b/fi-fi/ruby-fi.html.markdown
index 500951a8..17700e50 100644
--- a/fi-fi/ruby-fi.html.markdown
+++ b/fi-fi/ruby-fi.html.markdown
@@ -599,7 +599,6 @@ Something.new.qux # => 'qux'
 
 ## Lisämateriaalia englanniksi
 
-- [Learn Ruby by Example with Challenges](http://www.learneroo.com/modules/61/nodes/338) - Selaimessa tehtäviä harjoituksia tämän dokumentin hengessä
 - [An Interactive Tutorial for Ruby](https://rubymonk.com/)
 - [Official Documentation](http://www.ruby-doc.org/core-2.1.1/) - Virallinen dokumentaatio
 - [Ruby from other languages](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
diff --git a/fr-fr/java-fr.html.markdown b/fr-fr/java-fr.html.markdown
index 3932b2f3..471f0a8e 100644
--- a/fr-fr/java-fr.html.markdown
+++ b/fr-fr/java-fr.html.markdown
@@ -923,10 +923,12 @@ n'hésitez pas à consulter Google pour trouver des exemples spécifiques.
 
 **Pratiquer en ligne et tutoriels**
 
-* [Learneroo.com - Learn Java](http://www.learneroo.com)
-
 * [Codingbat.com](http://codingbat.com/java)
 
+* [Codewars - Java Katas](https://www.codewars.com/?language=java)
+
+* [University of Helsinki - Object-Oriented programming with Java](http://moocfi.github.io/courses/2013/programming-part-1/)
+
 **Livres** :
 
 * [Head First Java](http://www.headfirstlabs.com/books/hfjava/)
diff --git a/fr-fr/javascript-fr.html.markdown b/fr-fr/javascript-fr.html.markdown
index f7d1e9e7..f5d8fd5d 100644
--- a/fr-fr/javascript-fr.html.markdown
+++ b/fr-fr/javascript-fr.html.markdown
@@ -769,8 +769,6 @@ plutôt ici :
 [Document Object
 Model](https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core)
 
-[Learn Javascript by Example and with Challenges](http://www.learneroo.com/modules/64/nodes/350) quelques challenges.
-
 [JavaScript Garden](https://shamansir.github.io/JavaScript-Garden/) is an in-depth
 un guide pour vous éviter les faux-amis dans le JavaScript.
 
diff --git a/hu-hu/ruby-hu.html.markdown b/hu-hu/ruby-hu.html.markdown
index 0e185aa6..ca86c98e 100644
--- a/hu-hu/ruby-hu.html.markdown
+++ b/hu-hu/ruby-hu.html.markdown
@@ -548,7 +548,6 @@ Valami.new.qux # => 'qux'
 
 ## Egyéb források
 
-- [Learn Ruby by Example with Challenges](http://www.learneroo.com/modules/61/nodes/338)
 - [Official Documentation](http://www.ruby-doc.org/core-2.1.1/)
 - [Ruby from other languages](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
 - [Programming Ruby](http://www.amazon.com/Programming-Ruby-1-9-2-0-Programmers/dp/1937785491/) - A régebbi [ingyenes változat](http://ruby-doc.com/docs/ProgrammingRuby/) elérhető online.
diff --git a/id-id/java-id.html.markdown b/id-id/java-id.html.markdown
index 1600b91f..e640c3d3 100644
--- a/id-id/java-id.html.markdown
+++ b/id-id/java-id.html.markdown
@@ -784,10 +784,11 @@ Tip, trik, dan contoh lainnya dapat melakukan pencarian melalui Google atau mesi
 
 **Tutorial dan Praktik Online**
 
-* [Learneroo.com - Learn Java](http://www.learneroo.com)
-
 * [Codingbat.com](http://codingbat.com/java)
 
+* [Codewars - Java Katas](https://www.codewars.com/?language=java)
+
+* [University of Helsinki - Object-Oriented programming with Java](http://moocfi.github.io/courses/2013/programming-part-1/)
 
 **Buku**:
 
diff --git a/id-id/ruby-id.html.markdown b/id-id/ruby-id.html.markdown
index 7a66840c..7ef86f4c 100644
--- a/id-id/ruby-id.html.markdown
+++ b/id-id/ruby-id.html.markdown
@@ -613,7 +613,6 @@ Sesuatu.new.qux # => 'qux'
 
 ## Sumber tambahan
 
-- [Learn Ruby by Example with Challenges](http://www.learneroo.com/modules/61/nodes/338) - Varian dari referensi ini dengan tantangan dalam browser.
 - [An Interactive Tutorial for Ruby](https://rubymonk.com/) - Belajar Ruby melalui serangkaian tutorial interaktif.
 - [Dokumentasi resmi](http://www.ruby-doc.org/core-2.1.1/)
 - [Ruby from other languages](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
diff --git a/it-it/java-it.html.markdown b/it-it/java-it.html.markdown
index cfd4ce3a..5d8e290d 100644
--- a/it-it/java-it.html.markdown
+++ b/it-it/java-it.html.markdown
@@ -559,15 +559,16 @@ I link di seguito sono solo per capire l'argomento, cerca pure su Google degli e
 
 **Tutorial Online [in inglese]**
 
-* [Learneroo.com - Learn Java](http://www.learneroo.com)
-
 * [Codingbat.com](http://codingbat.com/java)
 
+* [Codewars - Java Katas](https://www.codewars.com/?language=java)
+
+* [University of Helsinki - Object-Oriented programming with Java](http://moocfi.github.io/courses/2013/programming-part-1/)
 
 **Libri [in italiano]** :
 
 * [Java la guida completa](http://www.amazon.it/Java-guida-completa-Herbert-Schildt/dp/8838667667/ref=sr_1_1?ie=UTF8&qid=1393422296&sr=8-1&keywords=java)
 
-* [Thinking in java](http://www.amazon.it/Thinking-Java-1-Bruce-Eckel/dp/8871923030/ref=sr_1_8?ie=UTF8&qid=1393422296&sr=8-8&keywords=java)
+* [Thinking in Java](http://www.amazon.it/Thinking-Java-1-Bruce-Eckel/dp/8871923030/ref=sr_1_8?ie=UTF8&qid=1393422296&sr=8-8&keywords=java)
 
 * [Manuale di Java 7](http://www.amazon.com/gp/product/0071606300)
diff --git a/it-it/javascript-it.html.markdown b/it-it/javascript-it.html.markdown
index 9f65fcca..fc2790e3 100644
--- a/it-it/javascript-it.html.markdown
+++ b/it-it/javascript-it.html.markdown
@@ -589,8 +589,6 @@ Il [Mozilla Developer Networ][1] fornisce una documentazione eccellente su come
 
 MDN's [A re-introduction to JavaScript][2] copre molti dei concetti qui trattati in maggiore dettaglio. Questa guida ha deliberatamente coperto solamente il linguaggio JavaScript; se volete sapere di più su come usare JavaScript in una pagina web, iniziate leggendo il [Document Object Model][3].
 
-[Learn Javascript by Example and with Challenges][4] è una variante di questo referenziario con integrate delle sfide.
-
 [Javascript Garden][5] è una guida approfondita di tutte le parti controintuitive del linguaggio.
 
 [JavaScript: The Definitive Guide][6] è una guida classica e referenziario.
@@ -608,7 +606,6 @@ In aggiunta ai contributori di questo articolo, alcuni contenuti sono adattati d
 [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript
 [2]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
 [3]: https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core
-[4]: http://www.learneroo.com/modules/64/nodes/350
 [5]: https://shamansir.github.io/JavaScript-Garden/
 [6]: http://www.amazon.com/gp/product/0596805527/
 [7]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
diff --git a/it-it/ruby-it.html.markdown b/it-it/ruby-it.html.markdown
index b99db7df..566d492f 100644
--- a/it-it/ruby-it.html.markdown
+++ b/it-it/ruby-it.html.markdown
@@ -644,7 +644,6 @@ Something.new.qux #=> 'qux'
 
 ## Ulteriori risorse
 
-- [Learn Ruby by Example with Challenges](http://www.learneroo.com/modules/61/nodes/338) - Una variante di questa guida con esercizi nel browser.
 - [An Interactive Tutorial for Ruby](https://rubymonk.com/) - Imparare Ruby attraverso una serie di tutorial interattivi.
 - [Official Documentation](http://ruby-doc.org/core)
 - [Ruby from other languages](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
diff --git a/java.html.markdown b/java.html.markdown
index 293aa2ec..2756e3dc 100644
--- a/java.html.markdown
+++ b/java.html.markdown
@@ -1053,7 +1053,6 @@ The links provided here below are just to get an understanding of the topic, fee
 
 ### Online Practice and Tutorials
 
-* [Learneroo.com - Learn Java](http://www.learneroo.com)
 * [Codingbat.com](http://codingbat.com/java)
 * [Codewars - Java Katas](https://www.codewars.com/?language=java)
 * [University of Helsinki - Object-Oriented programming with Java](http://moocfi.github.io/courses/2013/programming-part-1/)
diff --git a/javascript.html.markdown b/javascript.html.markdown
index b3fcbb6f..60935719 100644
--- a/javascript.html.markdown
+++ b/javascript.html.markdown
@@ -641,9 +641,6 @@ here in more detail. This guide has quite deliberately only covered the
 JavaScript language itself; if you want to learn more about how to use
 JavaScript in web pages, start by learning about the [Document Object Model][3].
 
-[Learn Javascript by Example and with Challenges][4] is a variant of this
-reference with built-in challenges.
-
 [JavaScript Garden][5] is an in-depth guide of all the counter-intuitive parts
 of the language.
 
@@ -667,7 +664,6 @@ Mozilla Developer Network.
 [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript
 [2]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
 [3]: https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core
-[4]: http://www.learneroo.com/modules/64/nodes/350
 [5]: https://shamansir.github.io/JavaScript-Garden/
 [6]: http://www.amazon.com/gp/product/0596805527/
 [7]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
diff --git a/ms-my/javascript-my.html.markdown b/ms-my/javascript-my.html.markdown
index 3067188b..0285ee69 100644
--- a/ms-my/javascript-my.html.markdown
+++ b/ms-my/javascript-my.html.markdown
@@ -566,9 +566,6 @@ aturcara JavaScript dengan agak mudah; jika anda mahu belajar lebih lanjut
 tentang menggunakan JavaScript didalam laman web, mulakan dengan mempelajari
 tentang [Document Object Model][3].
 
-[Learn Javascript by Example and with Challenges][4] adalah variasi panduan ini
-dengan cabaran yang tersedia pakai.
-
 [JavaScript Garden][5] pula adalah panduan yang lebih terperinci mengenai
 semua bahagian bahasa aturcara ini yang bertentangan dengan naluri atau
 kebiasaan.
@@ -583,7 +580,6 @@ dan [JS Tutorial][7] di Mozilla Developer Network.
 [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript
 [2]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
 [3]: https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core
-[4]: http://www.learneroo.com/modules/64/nodes/350
 [5]: https://shamansir.github.io/JavaScript-Garden/
 [6]: http://www.amazon.com/gp/product/0596805527/
 [7]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
diff --git a/pl-pl/java-pl.html.markdown b/pl-pl/java-pl.html.markdown
index 35c561b4..7e47d525 100644
--- a/pl-pl/java-pl.html.markdown
+++ b/pl-pl/java-pl.html.markdown
@@ -999,9 +999,9 @@ Linki zamieszczone poniżej służą pomocą w zrozumieniu wybranego tematu, w r
 
 ### Tutoriale i ćwiczenia online po angielsku
 
-* [Learneroo.com - Learn Java](http://www.learneroo.com)
 * [Codingbat.com](http://codingbat.com/java)
 * [Codewars - Java Katas](https://www.codewars.com/?language=java)
+* [University of Helsinki - Object-Oriented programming with Java](http://moocfi.github.io/courses/2013/programming-part-1/)
 
 ### Książki po angielsku
 
diff --git a/pl-pl/ruby-pl.html.markdown b/pl-pl/ruby-pl.html.markdown
index d8367f4f..b4972713 100644
--- a/pl-pl/ruby-pl.html.markdown
+++ b/pl-pl/ruby-pl.html.markdown
@@ -586,7 +586,6 @@ Cokolwiek.new.xyz # => 'qux'
 
 ### Angielskie
 
-- [Learn Ruby by Example with Challenges](http://www.learneroo.com/modules/61/nodes/338) - A variant of this reference with in-browser challenges.
 - [Official Documentation](http://www.ruby-doc.org/core-2.1.1/)
 - [Ruby from other languages](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
 - [Programming Ruby](http://www.amazon.com/Programming-Ruby-1-9-2-0-Programmers/dp/1937785491/) - An older [free edition](http://ruby-doc.com/docs/ProgrammingRuby/) is available online.
diff --git a/pt-br/javascript-pt.html.markdown b/pt-br/javascript-pt.html.markdown
index 905e373f..d331b62e 100644
--- a/pt-br/javascript-pt.html.markdown
+++ b/pt-br/javascript-pt.html.markdown
@@ -524,9 +524,6 @@ sobre e como usar o JavaScript em páginas na web, comece aprendendo sobre
 [Document Object
 Model](https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core)
 
-[Aprenda Javascript por Exemplos e com Desafios](http://www.learneroo.com/modules/64/nodes/350) é uma
-variação desse guia com desafios.
-
 [JavaScript Garden](https://shamansir.github.io/JavaScript-Garden/) é um guia
 profundo de todas as partes do JavaScript.
 
diff --git a/pt-br/ruby-pt.html.markdown b/pt-br/ruby-pt.html.markdown
index a44e2b11..6a5aa38f 100644
--- a/pt-br/ruby-pt.html.markdown
+++ b/pt-br/ruby-pt.html.markdown
@@ -440,7 +440,6 @@ Algo.new.qux # => 'qux'
 
 ## Recursos adicionais
 
-- [Aprenda Ruby com desafios](http://www.learneroo.com/modules/61/nodes/338) - Uma coleção de desafios para testar a linguagem.
 - [Documentação oficial](http://www.ruby-doc.org/core-2.1.1/)
 - [Ruby a partir de outras linguagens](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
 - [Programming Ruby](http://www.amazon.com/Programming-Ruby-1-9-2-0-Programmers/dp/1937785491/)- Um mais antigo [free edition](http://ruby-doc.com/docs/ProgrammingRuby/) e tambem uma versão online disponível.
diff --git a/ru-ru/java-ru.html.markdown b/ru-ru/java-ru.html.markdown
index 53e56dba..adc346cb 100644
--- a/ru-ru/java-ru.html.markdown
+++ b/ru-ru/java-ru.html.markdown
@@ -514,10 +514,11 @@ public class ExampleClass extends ExampleClassParent implements InterfaceOne, In
 
 **Уроки онлайн**
 
-* [Learneroo.com - Изучение Java](http://www.learneroo.com)
-
 * [Codingbat.com](http://codingbat.com/java)
 
+* [Codewars - Java Katas](https://www.codewars.com/?language=java)
+
+* [Университет Хельсинки - Объектно-ориентированное программирование на Java](http://moocfi.github.io/courses/2013/programming-part-1/)
 
 **Книги**:
 
diff --git a/ruby.html.markdown b/ruby.html.markdown
index 7170932d..d7080a78 100644
--- a/ruby.html.markdown
+++ b/ruby.html.markdown
@@ -667,7 +667,6 @@ Something.new.qux #=> "qux"
 
 ## Additional resources
 
-- [Learn Ruby by Example with Challenges](http://www.learneroo.com/modules/61/nodes/338) - A variant of this reference with in-browser challenges.
 - [An Interactive Tutorial for Ruby](https://rubymonk.com/) - Learn Ruby through a series of interactive tutorials.
 - [Official Documentation](http://ruby-doc.org/core)
 - [Ruby from other languages](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
diff --git a/sk-sk/ruby-sk.html.markdown b/sk-sk/ruby-sk.html.markdown
index 31216131..7d81cd1d 100644
--- a/sk-sk/ruby-sk.html.markdown
+++ b/sk-sk/ruby-sk.html.markdown
@@ -546,7 +546,6 @@ Nieco.new.qux # => 'qux'
 
 ## Ďalšie zdroje
 
-- [Nauč sa ruby v príkladoch s úlohami](http://www.learneroo.com/modules/61/nodes/338) - Variácia tejto referencie s úlohami v prehliadači.
 - [Oficiálna dokumentácia](http://www.ruby-doc.org/core-2.1.1/)
 - [Ruby z iných jazykov](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
 - [Programming Ruby](http://www.amazon.com/Programming-Ruby-1-9-2-0-Programmers/dp/1937785491/) - Staršia [bezplatná edícia](http://ruby-doc.com/docs/ProgrammingRuby/) je dostupná online.
diff --git a/ta-in/javascript-ta.html.markdown b/ta-in/javascript-ta.html.markdown
index 5477d31e..3888e75e 100644
--- a/ta-in/javascript-ta.html.markdown
+++ b/ta-in/javascript-ta.html.markdown
@@ -577,8 +577,6 @@ more about how to use JavaScript in web pages, start by learning about the
 [Document Object
 Model](https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core)
 
-[Learn Javascript by Example and with Challenges](http://www.learneroo.com/modules/64/nodes/350) is a variant of this reference with built-in challenges.
-
 [JavaScript Garden](https://shamansir.github.io/JavaScript-Garden/) is an in-depth
 guide of all the counter-intuitive parts of the language.
 
diff --git a/tr-tr/javascript-tr.html.markdown b/tr-tr/javascript-tr.html.markdown
index a693fe5f..3abd02c9 100644
--- a/tr-tr/javascript-tr.html.markdown
+++ b/tr-tr/javascript-tr.html.markdown
@@ -588,8 +588,6 @@ MDN'nin [A re-introduction to JavaScript(JavaScript'e Yeniden Giriş)][2] başl
 
 [Patika - Javascript][4]Hakan Yalçınkaya'nın eğitmen olduğu bu kaynak, Javascript'i baştan sonra öğrenmenizi ve öğrendiklerinizi çeşitli test, proje ve coding challenge'lar ile pekiştirmenizi sağlar.
 
-[Learn Javascript by Example and with Challenges][5] Bu da öğrendiklerinizi çeşitli challenge'lar ile pekiştirmenize olanak sağlar.
-
 [JavaScript Garden][6] tüm detaylarının derinlemesine incelendiği bir rehberdir.
 
 [Yusuf Sezer][7] Hem Türkçe hem yazılı olsun diyenler için kapsamlı bir kaynak.
@@ -600,7 +598,6 @@ MDN'nin [A re-introduction to JavaScript(JavaScript'e Yeniden Giriş)][2] başl
 [2]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
 [3]: https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core
 [4]: https://academy.patika.dev/courses/javascript
-[5]: http://www.learneroo.com/modules/64/nodes/350
 [6]: https://shamansir.github.io/JavaScript-Garden/
 [7]: https://www.yusufsezer.com.tr/javascript-dersleri/
 [8]: https://www.btkakademi.gov.tr/portal/course/javascript-8099
diff --git a/uk-ua/java-ua.html.markdown b/uk-ua/java-ua.html.markdown
index 08100751..6cce4c19 100644
--- a/uk-ua/java-ua.html.markdown
+++ b/uk-ua/java-ua.html.markdown
@@ -767,10 +767,11 @@ public class EnumTest {
 
 **Online-практика та посібники**
 
-* [Learneroo.com — Вивчаємо Java](http://www.learneroo.com)
-
 * [Codingbat.com](http://codingbat.com/java)
 
+* [Codewars - Java Katas](https://www.codewars.com/?language=java)
+
+* [University of Helsinki - Object-Oriented programming with Java](http://moocfi.github.io/courses/2013/programming-part-1/)
 
 **Книжки**:
 
diff --git a/uk-ua/javascript-ua.html.markdown b/uk-ua/javascript-ua.html.markdown
index 3f2dcb91..a6e84ad2 100644
--- a/uk-ua/javascript-ua.html.markdown
+++ b/uk-ua/javascript-ua.html.markdown
@@ -483,12 +483,11 @@ if (Object.create === undefined) { // не перезаписуємо метод
 
 ## Що почитати
 
-* [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript
-* [2]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
-* [3]: https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core
-* [4]: http://www.learneroo.com/modules/64/nodes/350
-* [5]: https://shamansir.github.io/JavaScript-Garden/
-* [6]: http://www.amazon.com/gp/product/0596805527/
-* [7]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
-* [8]: http://eloquentjavascript.net/
-* [9]: http://jstherightway.org/
+* https://developer.mozilla.org/en-US/docs/Web/JavaScript
+* https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
+* https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core
+* https://shamansir.github.io/JavaScript-Garden/
+* http://www.amazon.com/gp/product/0596805527/
+* https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript
+* http://eloquentjavascript.net/
+* http://jstherightway.org/
diff --git a/uk-ua/ruby-ua.html.markdown b/uk-ua/ruby-ua.html.markdown
index 9e6731d9..b39c1189 100644
--- a/uk-ua/ruby-ua.html.markdown
+++ b/uk-ua/ruby-ua.html.markdown
@@ -616,7 +616,6 @@ Something.new.qux # => 'qux'
 
 ## Додаткові ресурси
 
-- [Learn Ruby by Example with Challenges](http://www.learneroo.com/modules/61/nodes/338) - A variant of this reference with in-browser challenges.
 - [An Interactive Tutorial for Ruby](https://rubymonk.com/) - Learn Ruby through a series of interactive tutorials.
 - [Official Documentation](http://ruby-doc.org/core)
 - [Ruby from other languages](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
diff --git a/vi-vn/ruby-vi.html.markdown b/vi-vn/ruby-vi.html.markdown
index 6a1f2be0..a3f8088c 100644
--- a/vi-vn/ruby-vi.html.markdown
+++ b/vi-vn/ruby-vi.html.markdown
@@ -542,8 +542,7 @@ Something.new.qux # => 'qux'
 
 ## Các nguồn tham khảo thêm.
 
-- [Learn Ruby by Example with Challenges](http://www.learneroo.com/modules/61/nodes/338) - A variant of this reference with in-browser challenges.
 - [Official Documentation](http://www.ruby-doc.org/core-2.1.1/)
 - [Ruby from other languages](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
 - [Programming Ruby](http://www.amazon.com/Programming-Ruby-1-9-2-0-Programmers/dp/1937785491/) - An older [free edition](http://ruby-doc.com/docs/ProgrammingRuby/) is available online.
-- [Ruby Style Guide](https://github.com/bbatsov/ruby-style-guide) - A community-driven Ruby coding style guide.
+- [Ruby Style Guide](https://github.com/bbatsov/ruby-style-guide)
diff --git a/zh-cn/javascript-cn.html.markdown b/zh-cn/javascript-cn.html.markdown
index 76d043d4..3812d210 100644
--- a/zh-cn/javascript-cn.html.markdown
+++ b/zh-cn/javascript-cn.html.markdown
@@ -476,8 +476,6 @@ JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introdu
 [Document Object
 Model](https://developer.mozilla.org/en-US/docs/Using_the_W3C_DOM_Level_1_Core)
 
-[Learn Javascript by Example and with Challenges](http://www.learneroo.com/modules/64/nodes/350) 是本参考的另一个版本，并包含了挑战习题。
-
 [Javascript Garden](https://shamansir.github.io/JavaScript-Garden/) 是一个深入
 讲解所有Javascript反直觉部分的导引。
 
diff --git a/zh-cn/ruby-cn.html.markdown b/zh-cn/ruby-cn.html.markdown
index 07e65d3e..68ea7909 100644
--- a/zh-cn/ruby-cn.html.markdown
+++ b/zh-cn/ruby-cn.html.markdown
@@ -651,7 +651,6 @@ Something.new.qux # => 'qux'
 
 ## 其它资源
 
-- [Learn Ruby by Example with Challenges](http://www.learneroo.com/modules/61/nodes/338) - A variant of this reference with in-browser challenges.
 - [An Interactive Tutorial for Ruby](https://rubymonk.com/) - Learn Ruby through a series of interactive tutorials.
 - [Official Documentation](http://ruby-doc.org/core)
 - [Ruby from other languages](https://www.ruby-lang.org/en/documentation/ruby-from-other-languages/)
diff --git a/zh-tw/javascript-tw.html.markdown b/zh-tw/javascript-tw.html.markdown
index 94edce4b..72ce1b62 100644
--- a/zh-tw/javascript-tw.html.markdown
+++ b/zh-tw/javascript-tw.html.markdown
@@ -585,8 +585,6 @@ const add = (firstNumber, secondNumber) => {
 
 MDN 的 [重新介紹 JavaScript][2] 一文中，提到關於本文之外的更多細節。本文聚焦於 JavaScript 語言本身；若您想學習更多關於如何在網頁中使用 JavaScript，可以從閱讀 [文件物件模型][3] 開始。
 
-[Learn Javascript by Example and with Challenges][4] 是另一個參考網站，其包含線上的實戰練習。
-
 [JavaScript Garden][5] 是一份深入探討這門語言所有反直覺部分的指南。
 
 [JavaScript 大全][6] 是一本經典的指南和參考書。
@@ -602,7 +600,6 @@ MDN 的 [重新介紹 JavaScript][2] 一文中，提到關於本文之外的更
 [1]: https://developer.mozilla.org/en-US/docs/Web/JavaScript
 [2]: https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Language_overview
 [3]: https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model/Using_the_Document_Object_Model
-[4]: http://www.learneroo.com/modules/64/nodes/350
 [5]: https://shamansir.github.io/JavaScript-Garden/zhtw/
 [6]: https://www.tenlong.com.tw/products/9789865027322
 [8]: https://www.tenlong.com.tw/products/9789865029890?list_name=srh