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Those are optional challenges, no need to complete those. I think the confusion comes from the space between the two sentences

Optional challenges

Optional challenges you can complete for boasting rights.

This week:

1. Use Godot Engine;
2. Enemies are not the bad guys;
3. Use monochrome color scheme;
4. Implement tripple jump;
5. Add an Easter egg (known movie or a game).
6. Share the source code of your project.