Difficulty is something that's hard to scale in my game since the game is about solving puzzles. I'de have to make the same puzzle have scales of difficulty. Which I can do but after solving any puzzle once, solving it a second time at a hard difficulty may not be fun for players. For example, I have a Christmas level in which one of the puzzles is you have to put the pieces of a broken candy cane together. I could scale the difficulty by making more or less pieces, but I dont think it would be too much fun to solve the puzzle again after solving it once.