Untitled Goose Game is a stealth game in which players take control of a goose. The goose can walk, honk, flap its wings, and reach out for items. It can interact with objects and people.
The game is set in a village and the goal is to complete a number of tasks as the goose. These tasks often involve interacting with non-playable characters (NPCs) who react to the goose's behaviour.
The game is structured in a staged sandbox, where the player can move from one area to the next by completing challenges
Source: Wikipedia, "Untitled Goose Game", available under the CC-BY-SA License.