Canonical added a couple of days ago a selection of games from the MumboJumbo software publisher, available for purchase only via Ubuntu Software Center.
The games from MumboJumbo include 7 Wonders: Magical Mystery Tour (jewel game), Chainz Galazy (link-matching game), Unlikely Suspects (mystery game), and Midnight Mysteries 3 Devil on the Mississippi (adventure game).
The price for these games starts from $4.99 USD (3.6 EUR). They are available, at the moment, only in the Ubuntu 10.10 (Maverick Meerkat) and the Ubuntu 11.04 (Natty Narwhal) operating systems.
The MumboJumbo games will probably be added soon to the newly released Ubuntu 11.10 (Oneiric Ocelot) distribution.
In the same news, the Atom Zombie Smasher game from Blendo Games is also available in Ubuntu Software Center at the price of $9.99 USD (7.3 EUR).