Oh the PSP has 32 mb ram so it could run jj2. And the new PSP Slim has 64 mb of ram.

Anyway jj2 WOULD in fact work for NDS. I mean look at Mario 64 and the amount of ram that uses up but yet the textures and sound modules were compressed and able to be loaded in the Nintendo DS. So no doubt JJ2 COULD be built for DS. Would they? Doubtful. I have a DS and so far i have not been very happy with the graphics on the thing. When you're comparing something like Mario Kart to PSP's Twisted Metal: Head On their's no comparison. It's just the DS is cheaper and was better advertised.