Raskulls, Ilomilo, and A World of Keflings aren't just connected through the shared "Games for the Holidays" promotion. They also each unlock extras in the other games.

In Ilomilo, you can get unlockable Keflings and Raskulls costumes for Ilo and Milo by purchasing the other games. Additionally, "You can unlock ilo and Doug as playable characters in Raskulls," says Raskulls dev Halfbrick, "and also unlock Raskulls characters within ilomilo and World of Keflings by purchasing the full range of games." And buyers of Raskulls or Ilomilo can build homes for characters from those games in A World of Keflings, according to a statement posted by Kotaku.

Even crazier: you can actually get Raskulls early by buying A World of Keflings. Raskulls can be bought from within that game, a week before its December 29 release. That's two out of the three games available early!
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LONG-AWAITED XBLA TITLE COMING IN DECEMBER FOR 800 POINTS

December 2nd, 2010 – After many months of anticipation, Halfbrick and Microsoft can officially announce the release date for Raskulls, the much-loved but extremely elusive XBLA title! As part of the Games for the Holidays promotion, Raskulls will officially launch on December 29th, 2010.

Games for the Holidays is an extremely exciting, entirely original promotion over the coming season. World of Keflings, Raskulls and ilomilo are the stars of the show, and participation in GFTH means some awesome exclusive content for XBLA players!

If you purchase all three GFTH titles, extra characters will unlock within the games. For example, you can unlock ilo and Doug as playable characters in Raskulls, and also unlock Raskulls characters within ilomilo and World of Keflings by purchasing the full range of games.

In addition to this, players can also gain early access to Raskulls by downloading World of Keflings on December 22nd and accessing it via the in-game purchase menu.

Raskulls is an amazingly fun action-platformer that has been tearing up major conventions such as PAX for months. A well-known upcoming XBLA game, it combines platforming, action and racing all wrapped up in a fantastic art style featuring the Raskulls themselves – adorable yet very cheeky little guys! With the epic single player Mega Quest, unlockable characters for Grand Prix and both local and online multiplayer, Raskulls is a massive package – for just 800 Microsoft Points!

Official Trailer: http://www.youtube.com/watch?v=qX4mYh1BaI8

For more screenshots, videos and news about Raskulls and Halfbrick, simply visit www.halfbrick.com

This article was originally published on Joystiq.