Please developer, I discovered a Genesis button mapping error. In games using 6 buttons as in Ultimate Mortal Kombat, the Y button is mapped together with the C button and so failures occur and there is a missing button to complete the mapping control of Genesis in all games that are used 6 Street Fighter , Mortal Kombat among other fighting games. I made this discovery doing tests of all possible ways to correctly map the 6 buttons and I was always missing the 1 of them, X, Y, Z and ABC are all but Y is synchronized with C and it is as if we were using the 2 in 1 button only. Thanks if you can correct this will be perfect the Genesis Emulation.