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.