If only we could get an arcade emulator to run the earlier SNK titles.
Sega MD: Rolling Thunder 2, Contra Hard Corps, Vectorman 1 & 2, Alien Soldier, Mega Turrican (not as good as the C64 or Amiga games), Terminator, Robocop Vs Terminator, Eswat: City Under Siege, Forgotten Worlds.
SNES: Super Star Wars trilogy, Contra 3, Cybernator, Hagane: The Final Conflict.
Not sure what works on DS emulators.