DoodleRun is a 2D runner where nothing exists until you draw it. Before anyone runs, the room splits a list of thirteen slots between the players, ground tiles, six kinds of creature, coins, three layers of background, and each of you claims a slot and paints it. Everyone also draws their own character. Then the game builds an endless track out of your scribbles and you run it together, on shared fate: if one player dies, everybody restarts.

The interesting part is the rig. A drawing is just a flat picture, so to make a monster walk you drop a few labelled points on it, left leg, right leg, head, and the engine treats the drawing as a rubber sheet stretched over a mesh. Each point pulls the pixels around it, so the legs swing and the body wobbles without anything ever being cut apart. Your monster stays exactly the drawing you made; it just starts moving.

Everything runs on plain Canvas 2D with hand-written physics and no build step, and drawings travel between players as small PNGs, about three kilobytes each, which is why a whole hand-drawn world fits through a realtime database meant for positions and scores.