That's the thing, though. I'd be awestruck to see a Portal 3D physics-like thing on the 89 and be playable, because I'd have no idea how the person pulled it of

That's the thing, though. I'd be awestruck to see a Portal 3D physics-like thing on the 89 and be playable, because I'd have no idea how the person pulled it off and as I said above it'd be mindblowing. If you're familiar with physics engines, perhaps you're familiar with how the GBA works at the hardware level and how a game for it is typically made? Super Monkey Ball Jr. is an example of a game that blew me away and I'm still not really sure how they pulled it off.