Arcade game · iPhone · Preparing for App Store release

How high can one oxygen atom climb?

Pull back and fling a small oxygen atom up from a kitchen stove, through the clouds and the storm belt, all the way to the stratosphere and beyond. Every collision is a chemical choice: pick one of three reaction cards and become water, rust, ozone or something stranger, while the bottom of the screen keeps rising behind you.

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Quick runs, real chemistry

Every bump changes what you are.

Three-card reactions

Hit hydrogen, a hot pan, a soda can or a lightning bolt and choose a safe, bold or absurd reaction. Each form moves differently: gases float, liquids cling to walls, solids smash, ions zap.

Build your climb

Pick catalysts as you rise, chase a short goal in each zone, and keep a reaction chain going for bigger scores. A Daily Experiment gives everyone the same run each day.

Seventeen endings

Fade away, rust in peace, ride the jet stream or become an ozone hero. Every ending comes with a short real-world science fact and is saved to your Codex.

Atom Up shows banner ads on the menu, results and Codex screens, never during a climb. Optional rewarded ads offer a revive, a card boost or an extra catalyst choice; the Daily Experiment has none of these boosts. A one-time Remove Ads purchase removes banners and makes those boosts free. Atom Up: Chemistry Climb is preparing for App Store release and is not yet presented here as publicly downloadable.