Actually the only code I have entered in so far is the master code (M) and there were multiple codes for it. These are them:
M (GSv3+ / CBv6+ / XPv4+)
903143A0 0C0C5090
M (CBv1-5 / XPv1-2)
F0100238 002F117B
M (AR2v2/GS2v2/SM3.8coder only)
0E3C7DF2 1456E7A5
F0100238 002F117B
I used the last of the 3 because its Gameshark V.2, but after that one didn't work, I tried the others. None of them could be highlighted, but only the one that I expected to work kept changing.
P.S. - The game is Kingdom Hearts Re: Chain of Memories since I know you guys are just gonna Google the codes anyway. :P
EDIT: I just tried entering codes into Kingdom Hearts 2 and they worked fine. It has to be a problem with the codes themselves.
M (GSv3+ / CBv6+ / XPv4+)
903143A0 0C0C5090
M (CBv1-5 / XPv1-2)
F0100238 002F117B
M (AR2v2/GS2v2/SM3.8coder only)
0E3C7DF2 1456E7A5
F0100238 002F117B
I used the last of the 3 because its Gameshark V.2, but after that one didn't work, I tried the others. None of them could be highlighted, but only the one that I expected to work kept changing.
P.S. - The game is Kingdom Hearts Re: Chain of Memories since I know you guys are just gonna Google the codes anyway. :P
EDIT: I just tried entering codes into Kingdom Hearts 2 and they worked fine. It has to be a problem with the codes themselves.