That handheld game that involves navigating steel balls through a maze? Now there’s a cocktail-hour version. This set of four Roller Coasters features maze-like indentations that serve the dual purpose of providing some grip when you place your drink down on one of them, and they also mimic the classic maze game. As condensation forms on your beverage glass, it drips down into the coaster’s groove, creating water-droplet formations that double as the steel balls from the original game.