Regarding mutation testing, you don’t write any “tests for your test”. Rather, a mutation testing tool automatically modifies (“mutates”) your production code to see if the modification will be caught by any of your tests.
That way you can see how well your tests are written and how well-tested parts of your application are in general. Its extremely useful.
I just beat this level yesterday!
It becomes easy… Once you know what the tricks are supposed to be, which the game doesn’t tell you at all.
For me, these were the tips I needed:
Supposedly the PSX version also has a video in the options menu which shows you a dev completing the course, with button prompts on screen.
Oh, and there’s a cheat code in-game to skip this level entirely.