Yeah. There are two different slot devices. Slot 1 devices like an R4/CycloDS let you play DS games. You store the games on MicroSD cards through USB and put those cards into the slot 1 devices. Slot 2 devices let you play GBA games. But most of the time you need something in the slot 1 device to play GBA games. For example, you could have a Slot 2 device that boots from the R4. I don't know much about the slot 2 devices , but if you simply want to play DS games then get an R4.