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Castle Crashers - the newest XBL arcade game, priced at a somewhat hefty 1200 MSP (video re-uploaded for HQ)
A quick tutorial on getting the achievement. The trick is following where the other deer go; when they group up in one general area, that means that there's a wall coming up, and that's where the door is. If that doesn't help, wait a little while for the light shining through the door to appear. Although, that's probably a bit tougher.
Everything else is straightforward.
If you want my opinion on the game, get it if you have the MSP to spend. I was addicted to that Simpsons arcade game when I was 7, and this is like it, only with an RPG aspect and Newgrounds' incredible sense of humor. It may get repetitive, but it's the kind of repetitive I like.