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One Part Each Chain Reaction
02 Oct 2026
16
1
Play free One Part Each Chain Reaction - Puzzle Games
One Part Each: Chain Reaction is a physics-based puzzle game where you complete clever mechanical machines by adding exactly one missing part. Choose from ramps, springs, bumpers, fans, magnets, gravity fields, and conveyors, then place your chosen component onto the blueprint.
Every puzzle follows one simple but challenging rule: you may add only one part to the existing machine. This limitation forces you to think carefully about how physics will affect Spark's journey. A ramp might change the direction of movement, a spring can provide a useful bounce, while a magnet, fan, or gravity field can completely change the path.
The game includes 24 handcrafted puzzles divided across four chapters, giving you plenty of carefully designed challenges to solve. Once you've completed the main puzzles, you can test your skills in an endless challenge designed for high scores. There is also a shared six-link Daily Machine, while link-based relays let you continue challenges together with friends.
Collecting gears adds another objective to every level. Try to guide Spark through the machine while picking up as many gears as possible before reaching the portal. You can reset a puzzle whenever your idea doesn't work and experiment with a completely different solution. Your progress is saved locally, so you can continue playing without creating an account or signing in. The interface is available in English, Russian, and Turkish.
Controls are designed to work smoothly on both desktop and mobile devices. Choose a part from the bottom of the screen and drag it into the dotted area of the blueprint. Rotate it using the on-screen buttons or Q and E, then select Launch or press Space or Enter to start the machine. Arrow keys move the part, R resets the puzzle, and Esc pauses on keyboard. On mobile, every action can be performed with touch controls. Add one part, master the physics, collect the gears, and turn each machine into a successful chain reaction.
How to play
Keyboard: arrow keys move the part, Q/E rotate it, Space or Enter launches, R resets, and Esc pauses.
