Sega has announced a free update for Puyo Puyo Tetris 2, which will add a bunch of new content to the game, including a special guest.

The free update is set to add a new co-op boss battle mode, new item cards and music, as well as four new playable characters. One of these new character is none other the Sonic the Hedgehog as seen in the screenshots above. The update will launch this week on January 14th.

Check out the new trailer below, along with a full breakdown of the update’s contents (via Gematsu):

• Four new characters added:
  • Sonic (from Sonic the Hedgehog series)
  • Lidelle
  • Ms. Accord
  • Ocean Prince
• “Boss Battle with Everyone” added to online modes. Up to four players can work together to defeat boss characters with Skill Battle rules to earn tons of experience points and powerful Item Cards you can only get here.
• New Item Cards added.
  • Ring
  • Barrier
  • Spiked Iron Ball
• Many cute new My Icons added.
• New background music added:
  • “Tropical Resort – Act 1” (Sonic the Hedgehog series)
  • “Lidelle’s Earnest Wish (Lidelle’s Theme)”
  • “Ms. Accord’s Lesson (Accord’s Theme)”
  • “Dignity of the Prince (Ocean Prince’s Theme)”

What do you think? Let us know in the comments.