Stuck on 20. Figured that had something to do with the one-armed bandit, but tried 1, the day number, and trying to add up days where the symbols in it appeared, but I'm obviously missing something here. (And I'm assuming 24 doesn't unlock until the rest of them are done.)
BUT THIS IS THE CUTEST THING EVER! It's weird! It's surprising! It's mostly not difficult, but it definitely makes you think about things from a different angle! I'm really enjoying it so far :D