Contraptix

Place ramps, gears, magnets, balloons and rockets, press Play and watch every piece set off the next one. Contraptix is a physics puzzle game where every level is an unfinished machine: you add the missing parts and real physics decides whether it works.

★ 300 LEVELS ACROSS 75 STAGES
Start with simple chain reactions and finish with huge machines full of belts, pulleys, pipes, switches and timers. Every stage introduces a new part.

★ A THOUSAND WAYS TO SOLVE IT
There's no single answer. There's always a spare part on purpose: choosing well is part of the puzzle. Use few parts and be quick to earn all three stars.

★ PARTS WITH PERSONALITY
Bouncing balls, gears passing on their spin, fans, scissors that cut ropes, boxing gloves, light bulbs, cannons, trampolines and a mouse running in its wheel. Plus lasers and mirrors, portals, springs, electromagnets, dynamite and upside-down gravity zones.

★ DAILY CHALLENGE
A new puzzle every day. Fewest parts wins; on a tie, the fastest. Compete on the world and country leaderboards.

★ FREE MODE
Build whatever you like with every part you've discovered.

★ COMMUNITY
Build your own maps in Free mode, remove some parts and publish them as a challenge. Play other players' maps, rate them and climb the community and creator leaderboards.

★ ACHIEVEMENTS
Unlock achievements and compete on the Google Play Games leaderboard.

★ PLAY YOUR WAY
No sign-up, plays offline. Link Google or Apple whenever you like and your progress follows you to any phone. Available in 9 languages.

Contraptix is free, with ads and optional in-app purchases (coins for hints and removing ads).