Ourself

Ourself is an online co-op physics platformer for exactly two players who share a single ragdoll body. Each player controls one half of the body: one arm, one leg and their own camera. Walking, jumping, climbing ropes and monkey bars, and carrying a crate all require both players to act together; a jump only works if both press within 0.2 seconds. Players climb 400 m through The Sky Kingdom across 36 checkpoints, from a meadow to the Ruined Keep, past pistons, swinging hammers, cannons and fans, and use a fishing rod as a grappling hook. A fall of 1.5 m or more knocks the character out. The game has a Campaign mode with checkpoints, a Time Trial mode without checkpoints, four secret trials and built-in voice chat. Each player needs their own copy; there is no single-player or split-screen mode.