This app is a game that simulates the life of a hedgehog: its search for food, a mate, and so on. The game is played over seven rounds, representing seven years of its life. The hedgehog must move around to find food and increase its weight to reach a minimum weight before hibernation. If it reaches a weight of 1 kg at the end of the seventh year, the game is won. The app works with the Robert the Hedgehog robot. There are three different game levels plus a simplified level for children.