Play Konami Games on Emulator Online. All the best Konami games online for different retro emulators including GBA, Game Boy, SNES, Nintendo and Sega. There are many online Konami games in the collection. All of the games that you see here are without download, pick any and start playing right away. If you enjoy the game, be sure to vote for it and leave a comment. Konami games that started it all back in the day are now playable within your browser! Start by playing some popular Konami online games like Castlevania, Contra, Yu-Gi-Oh! GX - Duel Academy and Super Castlevania IV.