When making big projects if you have created lots of small sets of code in different classes or repeated code, it can make it a lot more confusing when someone else or you try to look back over it.

Have a look at the two links of code underneath and work out which one is created with clean code and which is not.

https://scratch.mit.edu/projects/352229277/editor

https://scratch.mit.edu/projects/352229279/editor

How to code cleanly:

• Don’t use lots of “When Green Flag Clicked” blocks try to combine them into one block so it can be read through easily.
• When naming variables and broadcasts use sensible names such as lives and score rather than using random letters such as “a” or “aaa”.
• Only keep code relevant to a sprite within its code.