From his IGN Blog:

Some time ago, I blogged about playing a cancelled version of Halo DS. The game was the real deal, created by a real development studio and with a very big publisher. But for reasons we won’t discuss, Halo DS was never released. Clearly. Obviously. Still, it would’ve been cool, huh?

My Halo DS blog has haunted me since I posted it because many people were skeptical of my claims. I wouldn’t make something like that up, of course, but that hardly silenced any of my critics. When my brother called me the other day and told me that I even have a Wikipedia page that calls into question my Halo DS blog, I realized I had to at the very least prove that I hadn’t completely hatched the entire thing. So I figured what better way to mute naysayers than to show off the game I played. With that in mind, I present to you Halo DS videos and screenshots below. Please, somebody update my Wikipedia page.

So Matt isn’t a liar, about this at least…