Echo is a 2.5d platformer, with fully 3d backgrounds and 2d characters.

The Idomu Engine features imported 3d backgrounds and characters with hierarchal animation. Engine operates in movie mode (for realime cinematics) and game mode which smoothly interpolates between character animations. Direct3D.

The Octagon Engine featured imported 3d backgrounds and characters. Animation was hardcoded. Characters could swim, run, walk, tiptoe or fly. Collision detection. Character would fall on behind and get hat knocked off if it ran into a wall. Following camera and area based static cameras (like walking past a security camera). Direct3D

The Hayaku Engine used by RocketRace was heavily modified for a four wheel vehicle to make the Velocity Engine.

Chrono is tile-based 2d platformer with enemy AI, hidden secrets, and 9 unique levels for DirectDraw.