Just Cause 2 became a sleeper hit because of this, thanks to the combination of a large game world, a grappling hook, and a reusable parachute. Sandbox games like Grand Theft Auto V ($15.00 at Amazon UK) tend to be really enjoyable when you ignore missions and just play around in the world, seeing how much you can abuse and break the systems there. Some games are really fun when you step outside of the intended gameplay cycle.
