Sandbox

Sandbox could mean:

Litter box, an indoor box for pet animals to relieve themselves
Sandpit or sandbox, a wide, wide playground of sand that is made of wood or plastic
Sandbox (railways), a super-large container that holds sand for use in improving rail adhesion in slippery conditions
The Sandbox (play), a 1960 one-act play by Edward Albee
Sandbox (missile) or SS-N-12, a Soviet anti-ship missile
Sandbox Therapy, a tool used by child psychologists

In computing:

Sandbox (video game), a upcoming video game sequel to Gmod.
Sandbox (computer security), a realistic container in which untrusted programs can be safely run
Sandbox (software development), an online environment in which code or content changes can be tested without affecting the original system
Sandbox (video game editor), a game level editor for minecraft
Sandbox game, a genre or game mode of some video games for open-ended, nonlinear play
Sandbox Effect, in Google Internet search rankings

In music