Randomizers are community-made tools that shuffle a game's content -- item locations, enemy placements, boss orders, even room connections -- to create a fresh experience every playthrough. They are the perfect antidote for players who have a classic game memorized down to every pixel. The best randomizers do not just shuffle blindly; they use logic to ensure the game is always completable, creating a puzzle-solving layer on top of the original game. Randomizer races, where two players compete through the same randomized seed, have become a thriving competitive format.