For example, if you don't have this program, then a map with 20 elves is suitable for you (as an example), but if you download it, then you need a map with 40 elves.
If it were that simple, no checks would even be needed; you could just ask:
- What was the result?
- N days
- Did you cheat?
- Of course not.
- Well done, you're the winner.
:D :D :D