Free Science Games

Physics, chemistry, biology and earth science, each modelled properly enough that the right answer falls out of the simulation rather than a lookup table. Balance makes you set coefficients until every atom balances on both sides of the equation. Gearworks chains levers, pulleys and gears to hit an exact mechanical advantage, which you compute rather than guess. Lens Lab has you bending a beam onto targets with mirrors and lenses, after first deducing what the hidden optics are doing. For university-level material, the Advanced Math and Science hub carries thermodynamics, organic synthesis and molecular biology.