It’s official. SEGA today announced and confirmed that it has inked a definitive partnership with Japan-based studio PlatinumGames. Under the agreement, SEGA will initially publish three original titles – Madworld, Infinite Line and Bayonetta. A fourth, yet-to-named title directed by Resident Evil/Biohazard series creator Shinji Mikami is also in the works.

Madworld, scheduled for Q1 2009 release exclusively on Wii, is a “hyper-violent” third-person action game sporting a stylish monochromatic visual style.

Space-based RPG Infinite Line is currently in development for the Nintendo DS. Along with a cast of 200 characters, the game is said to feature emphasis on customization, with players invited to build and control over 150 spaceships.

Bayonetta is a fact-paced action game that promises to push the genre to its limits. Directed by Devil May Cry series creator Hideki Kamiya, the game is set for a release on PlayStation 3 and Xbox 360 in 2009.

Madworld and Bayonetta Screenshots

Read more: Bayonetta Slips To January 2010, SEGA Confirms Sonic And The Black Knight For Spring 2009, Mario and Sonic Head To Olympic Winter Games, SEGA Aims To Better Integrate Western, Eastern Divisions, SEGA Bringing Bleach DS Sequel Stateside