20 machines. Four chapters. 60 stars.
Drag a placed part to move it. Select it for rotate, copy and delete controls. For planks, choose Plank, then press, drag and release on the board. Drag either end to reshape it. Locked parts stay where they are.
Choose Wire, Rope or Belt, then click or tap the first part and the second part. Wires join electrical parts; belts join motors and cogs; ropes join any two parts.
Every puzzle opens with its objective, parts and connection rules. View challenge opens this card again at any time. Leave Beat the clock unticked to explore freely, or choose a timed challenge. The timer counts active building and testing; it pauses for instructions, hints, physics activities and hidden tabs. If time runs out, your layout stays in place.
A pass waits for the ball to clear the net, settle in its tray, or complete the level’s final action. Let the machine finish moving, then check your Passed card for time taken, test runs, parts, connections, hints, stars and the physics behind your solution.
Finish without hints for three stars, with one hint for two, or with both hints for one. Opening the hint panel is free; only revealing a hint counts. Retries, the physics activities and normal snapping never cost stars. Hints stay used through retries and reloads. After a win, choose Replay for 3 stars to start fresh. Your best score is kept.
Press Play machine. Watch how the parts interact, then choose Back to build to restore every part to its original position. Keep adjusting until the objective is complete. Use 2× for faster runs or Pause to inspect the action.
Sandbox unlocks every part. Save a machine in this browser, or export it as a file that another player can import. Up to 60 parts and 120 connections fit in one machine.
Space: Play / Back to build. Q and E: rotate. Delete: remove. Ctrl/Cmd+Z: undo. Escape: cancel placement or connection. The grid snaps placement; nearby shelves help upright parts sit neatly. Use + and − to zoom, Fit to restore the view, and drag empty space to pan when zoomed in.