The following is a tech demo for the Nintendo DS created by Climax based on Rare Ltd’s Diddy Kong Racing. This demo is dated as being produced on May 27th, 2004, about five months before the release of the DS! It (mostly) works fine on modern emulators, minus some graphical issues. This version of the demo also appears to have no proper collision, allowing players to drive through walls.
Massive thanks to Rezrospect for his generous donation to get this preserved!