Each stage presents a goal and a limited set of parts. Players drag and place objects into the playfield, then start the machine and watch how gravity, momentum, timers, and collisions interact. Many puzzles allow multiple solutions, but success requires careful placement so one mechanism triggers the next. The game includes structured puzzle scenarios and a free-build mode for experimentation. Progress is typically based on completing individual contraptions rather than traditional action or exploration.

Start by identifying the final objective and trace the chain backward. Use cheap, reliable triggers first, and avoid overcomplicating early links. Small timing adjustments often matter more than adding extra parts. If a puzzle has multiple valid paths, test each subassembly separately before committing to the full machine. In free-build mode, experiment with component interactions to learn which objects create the most dependable chain reactions.

Tips and tricks

Build from the goal backward: place the final trigger first, then connect each preceding step.

Tips and tricks

Test one section at a time to isolate failures in long chain reactions.

Tips and tricks

Use gravity and simple motion whenever possible; elaborate setups can become unstable quickly.

User Reviews

Praised for inventive puzzles and satisfying chain reactions.

User Reviews

Often remembered as one of the most influential physics puzzle games on PC.

User Reviews

Some players find later puzzles tricky, but the trial-and-error process is part of the appeal.