Prolific DS/3DS developer Renegade Kid made a demo for a Crash Bandicoot DS game years ago. The test for Crash Landed was done in 2008 or 2009 for publisher Activision, according to Nintendo World Report's source, but the game was not picked up. Several Crash games were made for DS, but this was not one of them.
Now, for the first time, video of the unfinished (barely started!) demo has surfaced on YouTube. Renegade Kid co-founder Jools Watsham verified the existence of the demo, calling the video "a blast from the past" and revealing that the demo took two weeks to make.