Wolfenstein 3D – Gameboy cartridge with co-processor
It's crazy to remember that the GBC lacked even Mode 7, of which something comparable wouldn't come to Nintendo handhelds until the Game Boy Advance. A full raycaster running on the Color, at a high frame rate no less, is a very strange sight.<p>I wonder just how wildly impractical it would have been to build such outboard hardware acceleration into a cartridge in 1998.