AtomForge: the free chemistry game from atoms to reactions
Start here: Meet the atom · Seven quick questions about protons, neutrons and electrons. · About 3 minutes
AtomForge builds chemistry a level at a time, covering the first 20 elements in real depth. Start with Meet the atom: seven quick questions about protons, neutrons and electrons, and each right answer adds particles to a carbon atom. Later levels move through electron shells, ions, ionic and covalent bonds, the periodic table, balancing equations, and acids and bases. Aimed at middle and high school, it's free, needs no account and has no ads. Diffy measures product use to improve the service.
What kids learn
- Atomic structure: protons, neutrons, electrons, and mass number
- Electron-shell filling (2, 8, 8) and finding valence electrons
- Ions, isotopes, and naming, plus the octet rule
- Ionic and covalent bonding and balancing chemical formulas
- How the periodic table is organized by groups, periods, and reactivity
- Balancing equations, reaction types, the pH scale, and polyatomic ions
How it works
Each level opens with a short narrated tutorial you can watch or skip, then a set of multiple-choice steps with instant feedback and a teaching note. A diagram beside each question — an atom, a family of isotopes, a formula — updates as you answer. Answer choices include realistic distractors, stars reflect first-try accuracy, and each result points to the next level.
Kids can play without signing in; guest stars stay until you reload or close the page. A grown-up signs in once and adds a player for each kid, so AtomForge's stars and progress save to your account and follow you to any device.
Also try
- GeneLabAges 11–16
Tap your way from the atoms of life to DNA, codons and proteins.
Play GeneLab → - QuarkQuestAges 12–16
Zoom into the atom: quarks, forces, antimatter and the Higgs.
Play QuarkQuest →
Ready to play AtomForge?
It's free and has no ads. Diffy measures product use to improve the service. Ages 11–16.