Is there a way to play gba roms on the m3 simply? If so, can someone please help me out iwth some instructions on it
I'm pretty sure he was asking about the M3 Simply. You could get a slot-2 M3 described in the link above, but those cost about 80 USD, not counting the price of a MicroSD. I'd go with the EZFlash 3-in-1, you can get it for about 20 USD Here, a quick review Here, and an article about using it with an M3 Simply or R4 Here (Slot-2 Expansion).
Yeah, the 3-in-1 needs a slot-1 card to work, and it can't play NDS games, the review I gave you is for the EZFlash V, which is a slot-1 card, but the 3-in-1 is the expansion described near the bottom of the page.