The Xbox 360 version of Call of Duty: Modern Warfare 2 has had a curious side effect on a handful of Live Arcade games. Infinity Ward's modern military shooter is unlocking the full versions of five SNK games for free.
According to a report on Worthplaying, Modern Warfare 2—the full version of the game and its recently released downloadable demo—unlocked full, freely playable versions of Garou: Mark of the Wolves, The King of Fighters '98: Ultimate Match, Metal Slug 3, Metal Slug XX and Samurai Shodown II. Other SNK games (Fatal Fury Special, Neo Geo Battle Coliseum ) don't appear to be affected by the glitch.
All players need to do is access the demo versions of those SNK games from the guide button while playing Modern Warfare 2 and "quick launch" them.
Worthplaying explains further how the unusual unlock works, a bug we expect Microsoft, SNK and Activision might be scrambling to fix.
'Modern Warfare 2' (ALL) Bug Grants Free SNK Games [Worthplaying - thanks, Drtyfrnk!]