Trizeal is a Japanese shoot 'em up arcade game developed by Triangle Service, a small Japanese videogame development company. Running on Sega NAOMI hardware, the game was ported to the Sega Dreamcast in 2005, making it one of the few officially licensed games to be released for the system after it went out of production.
The Dreamcast version offers a score attack mode, a sound test mode and new stages that weren't in the arcade version. A PlayStation 2 version was released in January 20, 2006, and there is also a Microsoft Windows version.
Although this game is a Japan-only release it is quite "import-friendly" as there is some English displayed during game play.
The game was made by only 3 staff members and the console conversions were handled by only 1 person.
Players control and can transform a spaceship into three forms, working through multiple levels and boss sequences. The game can be played in four different screen modes, with one mode mimicking the narrow arcade version. A ship from Triangle Service's previous release, XII Stag, is hidden in the game and can be unlocked by holding the "X" button before selecting a stage in Stage Attack mode.
There are 6 levels in the game, they get progressively harder until the last stage which consist of only two bosses. Two unlockable modes become available when the game is completed, they are Omake mode and Lifting mode. Omake mode is a short level which has denser bullet patterns than the normal game, lifting mode is where you have to juggle a stone on your ship to score points.