In Infinity Ward’s defense, we don’t imagine “unlocks a full copy of The King of Fighters ’98 Ultimate Match” is a common bug to check for.
So, here’s how it works: Modern Warfare 2 – whether it’s the recent single-player demo or the full game – has turned SNK’s selection of XBLA games into an all-you-can download buffet. Well, some of them, anyway. Garou: Mark of the Wolves, The King of Fighters ’98 Ultimate Match, Metal Slug 3, Metal Slug XX, and Samurai Showdown II are the only games that have been affected, oddly enough.
Other XBLA games – SNK-published or not – have managed to avoid the five-finger discount ray, meaning there’s a slight chance this bug is sentient, and instead of taking over the world, has decided that it just really loves certain SNK games. “Just one more match” against Geese and then you’ll start the apocalypse, huh? Yeah, we’ve all heard that one before.
Worthplaying has more details on exactly how the glitch works, but we doubt it’ll matter for too much longer, seeing as Microsoft, SNK, and Infinity Ward are probably scrambling to patch up this exceedingly odd money leak.