···419420### P.S.
421422-If this got you curious about Lean, go play the [Natural Number Game](https://adam.math.hhu.de/#/g/leanprover-community/nng4)! At least for a few minutes. It's weirdly addictive, plus you already know how to solve [Level 0](https://adam.math.hhu.de/#/g/leanprover-community/nng4/world/Tutorial/level/0).
···419420### P.S.
421422+If this got you curious about Lean, go play the [Natural Number Game](https://adam.math.hhu.de/#/g/leanprover-community/nng4)! At least for a few minutes. It's weirdly addictive, plus you already know how to solve Level 1.