Valence Science Puzzle

Welcome to Valence — a chemistry puzzle that turns real molecules into a game.

Place atoms. Match bonds. Build the molecule.

Every atom has a personality: hydrogen wants 1 bond, oxygen wants 2, nitrogen wants 3, and carbon wants 4. Each puzzle
is a real molecule — water, methane, ammonia, ethanol, benzene, even amino acids — and your job is to drop the right
atom into each empty slot so the bond counts line up perfectly.

Tap an atom from the tray, then tap a spot on the board. Get every slot right, watch the molecule come together with
confetti, and unlock the next level.

🧪 99 HAND-CRAFTED LEVELS OF REAL CHEMISTRY

From simple H₂ and water all the way to the hexagonal ring of benzene and the building blocks of life, Valence walks
you through real chemistry one molecule at a time:

• Starters — H₂, HF, water, ammonia, methane, O₂, N₂, CO₂
• Halogens & phosphorus — fluoromethane, chloroform, phosphine, PCl₃
• Functional groups — methanol, formaldehyde, formic acid, acetone, acetic acid
• Hydrocarbons — ethyne, ethene, ethane, propane, butane, hexane
• Rings — cyclopropane, cyclohexane, oxirane, furan, thiophene, pyrrole
• Aromatics — benzene, toluene, phenol, aniline, pyridine
• Biochemistry — glycine, alanine, serine, cysteine, lactic acid, glycerol, urea
• …and more, with single, double, and triple bonds rendered just like a real Lewis structure.

🎨 DESIGNED FOR CURIOUS MINDS

• Bouncy, friendly atoms that feel like little characters
• Real bond visuals — one, two, or three lines for single, double, triple bonds
• Each level shows the molecule's name, formula, and bond breakdown ("Bonds: 9 single, 3 double" — oh, that's
benzene!)
• Per-level best time and "NEW BEST!" celebrations to chase
• Smooth, tap-friendly controls
• Fully offline — no account, no login

🧠 EDUCATIONAL WITHOUT BEING PREACHY

Valence sneaks chemistry into your brain through play. After a few levels, you'll start recognizing atoms by their
bond count and seeing the hidden patterns behind real molecules — the same patterns chemists use every day. Great for
ages 8 and up. Challenging enough for parents too.

🛡️ PRIVACY-FIRST FOR FAMILIES

• No personal data collected
• No advertising ID used
• Only non-personalized, age-appropriate ads (compliant with Google Play Families policies)
• No accounts, no logins, no tracking
• Plays entirely offline

Whether you're a kid meeting molecules for the first time, a student warming up for chemistry class, or an adult who
just likes a clean little puzzle on the couch — Valence is for you.