Imploding Kittens: This is the First Expansion of Exploding Kittens Imploding Kittens is the first Expansion of Exploding Kittens, the award-winning card game that made Kickstarter history as the most-backed project, ever. This Expansion deck includes 20 new cards featuring 5 new types of actions and an "Imploding Kitten" which increases the game from 5 to 6 players. This is not a standalone game - it requires a copy of Exploding Kittens (any version) to play.