ok, I heard that they were making a halo for the DS, but it was canceled for obvious reasons, this is most likely a beta that got leaked and someone managed to get his hands on it, and I can tell that it was not the finished game because it wasn`t that polished, I have seen better graphics on an SNES then that, so don`t worry, Nintendo won`t be touching halo, unless some agreement between Microsoft and Nintendo takes place and money is exchanged, there will be no halo games for Nintendo or any other console/operating systems other than the Xbox, MS Windows or Macintosh, because we all know that theres no chance that halo will ever show up on a linux platform.
im almost 100% sure thats a mod for Rougue Agent, it looks EXACTLY like it, and you can dual wield in 007, and the text and bottom screen look just like it, and so do the bullets hitting the walls. if not, then the ppl who made it probably made Rouge Agent 007 (for DS).