You could make it like Little Big Planet so either Abe (player 1) or Mudokon (player 2) is in control depending on whoever is infront. If the player lagging behind goes offscreen, then that player dies (if it's Abe who dies, you respawn. If it's the Mudokon who dies, Abe could continue on alone, possibly met by a 2player-requiring passage, in which case he'd have to kill himself and restart the puzzle).
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