I am thinking of something from Undertale. It could be an object, a character, a location - heck it could even be a soundtrack. Anything. As the title suggests, the aim of the game is to try and figure out what I'm thinking of by asking 20 questions or less. They must be yes/no questions. Guesses count as questions. If you guess right, you can think of the next thing, or ask that someone else does so instead. If you don't reply in three days, someone else can think of the next thing. If all the questions get used up before the answer is guessed, the person who thought of the thing gets to think of the next thing. Uh... I hope all that makes sense.