Rock, Paper, Scissors. It's not only free but safe to play as well D=
Anyways, for rpgs probably Tales of Eternia and Mana Khemia (I play many rpgs but I won't complete them one way or another. ToE was the first completed rpg, followed by Mana Khemia) and there's Valkyria Chronicles as well. Fighting games are well, Tekken and Soul Calibur. PC is Gunbound, Ragnarok Online and Pangya (yes, the golf game =/)
But none is as epic as Syobon.
http://www.youtube.com/watch?v=aLrWwmnt2po
Seriously, Mario was lucky...