TriZeal , a sci-fi vertical-scrolling shooter, was released for the Sega Dreamcast. Using polygonal graphics, but retaining a completely 2D gameplay, it puts you in command of two tiny starfighters as you attempt to clear several stages filled with enemy ships and creatures.
The gameplay is simple yet challenging, requiring you to balance your ship's speed, armor, and weapon system by picking up power-ups. You can upgrade each form and increase its abilities to survive in all situations.
Additional features include a unique Bonus mode with additional stages not included in the arcade original, and 2-player cooperative gameplay, allowing you to play through the game with a friend or family member.