OK. For me, most game gear games really have no use for game genie as they tend to be easy and/or short, but there is one possible exception; ristar. For whatever reason, an entire level of the game is omitted when played in a US system, though it's not due to space reasons as it's STILL ON THE CART - god knows why they did it. Once I found this out, I began to wonder - could a game genie change the region the game cartridge sees in a game gear? I'd certainly buy one if this is the case, but I can't justify the purchase quite yet if it doesn't have that capability.