This is a fantastic first person shooting puzzle game based around boxes, switches and of course the portal. Shoot a blue portal and exit a red portal. Simple stuff like that. There is no fat in this game and seasoned players can probably beat it in an hour, but that is good. The game is kept short and sweet all while being pushed forward by a narrator / villain GLaDOS or however it is spelled. The passive aggressive villain. Anyway, this game is a joy and only a matter of time before it is free. It uses Valve’s source engine.