This CD image contains the classic First Person Shooter 'Marathon' created by Bungie software, also included are the two sequel games 'Marathon 2: Durandal', and 'Marathon: Infinity'. Many of the newer gaming generation will know Bungie Software for their later game HALO for the X-Box, all the older gamers will know that here's where HALO's origins started.
Bero's port of Aleph One to the Dreamcast is used so please note that you need a DC keyboard to play the games (you'll also need a controller to navigate the CD menu). Sadly, Bero's port was left at an early stage without VMU save support, but it still stands as a good example of the Dreamcast being a great platform for classic game engine ports.