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 - [**YAGNI**](https://thefullstack.xyz/dry-yagni-kiss-tdd-soc-bdfu) (You Aren’t Gonna Need It)
 - [**SOC**](https://thefullstack.xyz/dry-yagni-kiss-tdd-soc-bdfu) (Separation of Concerns)
 - Avoid Deep Nesting
+- Handling errors
 - Limit Line Length
 - File and Folder Organization
 - Consistent Temporary Names
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diff --git a/subjects/tetrisoptimizer/tetrisoptimizer.audit.en.md b/subjects/tetrisoptimizer/tetrisoptimizer.audit.en.md
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+#### Functional Project Questions
+
+##### Try bad example 00 (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/badexample00.md).
+`ERROR`
+###### Does the program prints the value above?
+##### Try bad example 01 (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/badexample01.md).
+`ERROR`
+###### Does the program prints the value above?
+##### Try bad example 02 (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/badexample02.md).
+`ERROR`
+###### Does the program prints the value above?
+##### Try bad example 03 (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/badexample03.md).
+`ERROR`
+###### Does the program prints the value above?
+##### Try bad example 04 (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/badexample04.md).
+`ERROR`
+###### Does the program prints the value above?
+##### Try bad format (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/badformat.md).
+`ERROR`
+###### Does the program prints the value above?
+##### Try good example 00 (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/goodexample00.md).
+###### Does the result contain 0 empty spaces (0 '.')?
+##### Try good example 01 (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/goodexample01.md).
+###### Does the result contain 9 empty spaces (9 '.')?
+##### Try good example 02 (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/goodexample02.md).
+###### Does the result contain 4 empty spaces (4 '.')?
+##### Try good example 03 (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/goodexample03.md).
+###### Does the result contain 5 empty spaces (5 '.')?
+##### Try hard example (https://github.com/01-edu/public/blob/master/subjects/tetrisoptimizer/hardexam.md).
+###### 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?
+###### Does one Tetromino has only one character?
+
+#### Basic
+
+###### +Does the project runs quickly and effectively (Favoring of recursive, no unnecessary data requests, etc.)?
+###### +Is there a test file for this code?
+###### +Are the tests checking each possible case?
+###### +Does the code obey the [good practices](https://github.com/01-edu/public/blob/master/subjects/good-practices.en.md)?
+
+#### Social
+
+###### +Did you learn anything from this project?
+###### +Would you recommend/nominate this program as an example for the rest of the school?
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