3 butons on top 3 on bottom, top are 123 bottom are 564 ...i use them this way,why? i dont play 6 buttons games that much. and the ones i do i simply configure mame for that particular game so the buttons are the correct order. so most 1 ,2 or 3 buttons games should be just fine with the top row, neogeo games, are just fine as well with the 3 top and the extra 4 on bottom. on mortal kombat i do configure mame for that particular game as well. so most folks inmediatly figure out the buttons layout, no need for manuals.