Nintendo, Capcom, Konami, Atlus, XSeed, Platinum, Treasure, Tecmo and Taito have a great list of classics. Zelda--the 2D ones are by far the best--Mario, Metroid, Little Nemo, Bubble Bobble, Rainbow Islands, Puzzle Bubble, Mega Man, Little King's Story, Shin Megami Tensei and Persona, Mother, God Hand, No More Heroes, Shadows of the Damned, Resident Evil 4, 5 and Revelations 1 and 2, Dragon's Dogma, Bucky O'Hare, Castlevania, Contra, Alien Soldier, Gunstar Heroes, Dynamite Headdy, Bionic Commando, Magic Sword, Wonderful 101, Devil May Cry, Kid Chameleon, Ikaruga, Ninja Gaiden, Double Dragon, Kunio Kun, Layla, Ai Senshi Nichol, Otocky, Twinbee, Parodius, Ghosts and Goblins, The Guardian Legend, Jet Set Radio, New Ghostbusters 2, X-Men: Mutant Apocalypse are all great choices.