Because the PSP fits nicely in a gamer's hands, it seems almost natural to want to tilt and move the device itself to control what's happening on-screen. Datel, best known for their "Action Replay" cheats, decided to fulfill that want with their Tilt-FX motion control device. Though it doesn't seem to have caught on widely, there must have been some demand for the product, as they not only made a PSP-1000 version but followed it up with a PSP-2000/3000 version. Interestingly, motion control has caught on recently with the big consoles and smartphones, and the PS Vita will have motion-sensing capabilities built in (and, no doubt, support for them from actual game developers).
