God, this is like the 8th thread about porting 3DS games and shit, dude the other threads werent old enough to attract flame for bumping.
:I
But while im here,
TF2. Quake 1 or 3, warhammer, some kind of sandbox like Gmod built off either the SM3DL engine or the MK7 engine (both had pretty good physics), Castle Crashers, Cave Story + (not that 3D shit) Half-Life 1 or 2 or BlueShift or Opposing force but NO LOST COAST (god that shit was stupid), I doubt Portal 2 can run on the 3DS but I would settle for 1, and a few indie game ports (Super Mario War, and Knitt Stories) but most of them are probly impossible to optimize the engines properly for the 3DS.