diff --git a/subjects/ascii-art/ascii-art-color.en.md b/subjects/ascii-art/ascii-art-color.en.md
index 328666f97..98d156098 100644
--- a/subjects/ascii-art/ascii-art-color.en.md
+++ b/subjects/ascii-art/ascii-art-color.en.md
@@ -2,7 +2,7 @@
 
 ### Objectives
 
-You must follow the same [instructions](https://public.01-edu.org/subjects/ascii-art/ascii-art.en.md) as in the first subject but with colors.
+You must follow the same [instructions](https://public.01-edu.org/subjects/ascii-art/ascii-art.en) as in the first subject but with colors.
 
 - The output should manipulate colors using the **flag** `--color=<color>`, in which `--color` is the flag and `<color>` is the color of choice.
 - The colors must respect the [RGB](https://en.wikipedia.org/wiki/RGB_color_model) concept.
diff --git a/subjects/tetris-optimizer/tetris-optimizer.audit.en.md b/subjects/tetris-optimizer/tetris-optimizer.audit.en.md
index 5f298efc3..d092c59d6 100644
--- a/subjects/tetris-optimizer/tetris-optimizer.audit.en.md
+++ b/subjects/tetris-optimizer/tetris-optimizer.audit.en.md
@@ -1,32 +1,32 @@
 #### Functional
 
-##### Try bad example 00 (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/badexample00.md).
+##### Try bad example 00 (https://public.01-edu.org/subjects/tetris-optimizer/badexample00).
 `ERROR`
 ###### Does the program prints the value above?
-##### Try bad example 01 (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/badexample01.md).
+##### Try bad example 01 (https://public.01-edu.org/subjects/tetris-optimizer/badexample01).
 `ERROR`
 ###### Does the program prints the value above?
-##### Try bad example 02 (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/badexample02.md).
+##### Try bad example 02 (https://public.01-edu.org/subjects/tetris-optimizer/badexample02).
 `ERROR`
 ###### Does the program prints the value above?
-##### Try bad example 03 (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/badexample03.md).
+##### Try bad example 03 (https://public.01-edu.org/subjects/tetris-optimizer/badexample03).
 `ERROR`
 ###### Does the program prints the value above?
-##### Try bad example 04 (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/badexample04.md).
+##### Try bad example 04 (https://public.01-edu.org/subjects/tetris-optimizer/badexample04).
 `ERROR`
 ###### Does the program prints the value above?
-##### Try bad format (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/badformat.md).
+##### Try bad format (https://public.01-edu.org/subjects/tetris-optimizer/badformat).
 `ERROR`
 ###### Does the program prints the value above?
-##### Try good example 00 (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/goodexample00.md).
+##### Try good example 00 (https://public.01-edu.org/subjects/tetris-optimizer/goodexample00).
 ###### Does the result contain 0 empty spaces (0 '.')?
-##### Try good example 01 (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/goodexample01.md).
+##### Try good example 01 (https://public.01-edu.org/subjects/tetris-optimizer/goodexample01).
 ###### Does the result contain 9 empty spaces (9 '.')?
-##### Try good example 02 (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/goodexample02.md).
+##### Try good example 02 (https://public.01-edu.org/subjects/tetris-optimizer/goodexample02).
 ###### Does the result contain 4 empty spaces (4 '.')?
-##### Try good example 03 (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/goodexample03.md).
+##### Try good example 03 (https://public.01-edu.org/subjects/tetris-optimizer/goodexample03).
 ###### Does the result contain 5 empty spaces (5 '.')?
-##### Try hard example (https://github.com/01-edu/public/blob/master/subjects/tetris-optimizer/hardexam.md).
+##### Try hard example (https://public.01-edu.org/subjects/tetris-optimizer/hardexam).
 ###### Does the result contain 1 empty spaces (1 '.')?
 ###### Are all of the Tetrominos contained in the test file, present in the output?
 ###### Different characters correspond to different Tetrominos?
diff --git a/subjects/tetris-optimizer/tetris-optimizer.en.md b/subjects/tetris-optimizer/tetris-optimizer.en.md
index e7cc4ced1..a2ea4b36f 100644
--- a/subjects/tetris-optimizer/tetris-optimizer.en.md
+++ b/subjects/tetris-optimizer/tetris-optimizer.en.md
@@ -8,12 +8,14 @@ Develop a program that receives only one argument, a path to a text file which w
 
 The program must :
 
--   Be written in Go
--   Compile successfully
--   Assemble all of the tetrominoes in order to create the smallest square possible
--   Identify each tetromino in the solution by printing them with uppercase latin letters (`A` for the first one, `B` for the second, etc)
--   Expect at least one tetromino in the text file
--   In case of bad format on the tetrominoes or bad file format it should print `ERROR`
+- Compile successfully
+- Assemble all of the tetrominoes in order to create the smallest square possible
+- Identify each tetromino in the solution by printing them with uppercase latin letters (`A` for the first one, `B` for the second, etc)
+- Expect at least one tetromino in the text file
+- In case of bad format on the tetrominoes or bad file format it should print `ERROR`
+- The project must be written in **Go**.
+- The code must respect the [**good practices**](https://public.01-edu.org/subjects/good-practices.en).
+- It is recommended that the code should present a **test file**.
 
 #### Example of a text File