We've found this game to be a perfect addition to any Tiny Whoop party! Before the party I hide these stickers around the room in semi-conspicuous places, then at some point in the party have a contest to see who can find them all fastest. One of the many additional games that make for the perfect Tiny Whoop party!
Stickers are "removable vinyl" but are probably one-time use. They won't leave any sticky residue when you remove them, and they're 2 inches square.