Contraption

Each level gives you a limited tray of parts and a ball that needs to reach the goal. Place parts on the field, aim them, and hit Run to drop the ball, the deterministic simulation plays out the physics. If it misses, scrub the timeline to rewind and step frame by frame, find the flaw, adjust, and try again. The more parts the ball actually uses, the higher your contraption scores.

• Pick a part, click to place it, drag while placing to aim ramps and fans
• Run the simulation, then drag the slider to rewind and debug
• Get the ball into the goal to clear the level
• Chaining more parts elegantly earns bonus points

• Desktop: click a tray part, click the field to place, drag to aim, Run, then scrub or step the timeline.
• Phone & tablet: tap a part, tap to place, drag to aim, and use the on-screen scrub controls, touch supported.

• Daily: one shared seeded level per day
• Practice: endless fresh levels

• Use the frame-by-frame scrubber as your debugger, pause exactly when the ball goes astray
• Aim ramps to feed the next part rather than straight at the goal; chained parts score more
• Small angle changes have big effects, so adjust one part at a time between runs

Contraption is a physics puzzle about building elaborate chain-reaction machines, training cause-and-effect planning.

• Skills: cause and effect, physics intuition, planning, problem-solving
• Best for: roughly grades 4–11 (ages 9–16)
• For parents & teachers: cause-and-effect engineering through play.

Contraption is an original free browser physics puzzle about building elaborate chain-reaction machines, with a scrubbable deterministic simulation for tuning every bounce. Made in-house for PlayPendium.

A free, original browser game on PlayPendium. No download, no install.

1. A level that proves itself solvable

   The game never hand-authors a puzzle. It grows one from a single number, and then it plays that puzzle against itself to make sure it is neither trivial nor impossible before you ever see it.