The little jelly tubs Bismo and Plom can do what most puzzle platform stars can do, including jumping, grabbing things, and shoving blocks around. The twist in Shift Happens is that size matters, meaning the big dude has to push the big blocks around while smalls squeezes into tiny spaces and makes the long leaps. Characters can toss each other around, too, and certain switches require more weight to activate. Swap sizes back and forth as you work both characters towards the exit. If Bismo or Plom dies the other can resurrect them, just make sure one character is safe and you'll stay in the game.