i'm pretty sure it can't technically damage the system or the games. however, the slots on the phantom-1 is really tight so you have to be careful when inserting and removing the carts. also, when inserting the phantom-1 into the system, make sure you have the connectors lined up properly with the slots. and finally, i wouldn't recommend inserting a game into the phantom-1 if it's already in the system. seeing as how the slots on the phantom-1 are really tight, it might cause some damage to the system's board if pushed on too hard. hope that helps.