Super Mario Bros. Crossover is, in my opinion, the only Flash game worth playing. The Internet-keen amongst you may have run across this already on other blogs, but I thought it was worth repeating here.
In SMBC, author Jay Pavlina masterfully recreates Super Mario Bros. in Flash with a surprising bonus: five additional playable characters pulled straight from iconic NES games. There's Link from The Legend of Zelda, Samus from Metroid, Mega Man from his self-titled game, Simon Belmont from Castlevania, and Bill R. from Contra.
Each character retains certain abilities from his respective game, and the SMB power-ups provide each with character-appropriate upgrades. It's an exhilarating feeling to destroy every brick you can find with Bill R's spread shot, or to blow up goombas by laying bombs with Samus. If you've ever wanted to gun down Bowser, here's your chance.
I don't want to spoil all the surprises. Play the game and find out more.