Elements and ions fall from the top. Place them side by side and they connect. A compound forms only when the bonds and charges balance. It's a falling-block puzzle that teaches high-school chemistry's reactions through your fingertips.
Available in English on iPhone, iPad and Android. See the Japanese page
H plus O makes −OH; add another H and you get H₂O. What you learn is "put A with B, and what do you get?" A compound is complete only when the bonds and charges balance, and as you steer the falling blocks, the patterns of each reaction stay in your hands.
Benzene is a hexagon, glucose is a ring, starch is a chain of three linked rings. Precipitates sink to the bottom; gases escape upward. The colors are the real colors. You take in what a reaction looks like, not just what it's called.
A 3-question quiz follows every stage, with the product hidden. The Codex has a Test button that masks the products. Reactions you get wrong are recorded, come back first in later quizzes, and their ingredients start falling more often, so they reach your hands again just as you begin to forget them.
Each of the 46 stages has someone to explain its key points. Sodium arrives wrapped in a yellow flame, fluorine boasts the strongest oxidizing power of all, and silica gel appears as a stone that drinks up water. Every stage opens with a short talk with Mol, the main character.
Work through high-school chemistry's reactions family by family, with your hands.
This game covers reactions. It does not include the calculation side of chemistry: moles, equilibrium, electrochemistry, thermochemistry or crystal lattices.
For anyone who struggles to memorize inorganic chemistry, can't make precipitate colors or gas preparations stick, or wants organic reactions to fall into families. Learn reactions one-handed, in spare moments.
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