A sandbox game is a video game with a gameplay element that provides players a great degree of freedom to interact creatively, usually without any predetermined goal, or with a goal that the players set for themselves. Such games may mostly or totally lack any end goals, and are sometimes referred to as non-games or software toys. They are often a product of creative elements being incorporated into other genres and systems allowing for emergent gameplay. Sandbox games are often associated with an open world structure, giving the players freedom of movement and progression in the game's world. The game design term "sandbox" derives from the nature of a physical sandbox, which lets people create nearly anything they want within it.