Steer falling blocks into a tank of liquid layers — each sinks through lighter liquids and rests on the first denser one, so work out mass ÷ volume and fill a layer to clear it.
A free, no-signup, no-ads science game for Grades 6–8 — predict what will happen, watch the real result, and see why. Explore all science games or more matter games.
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What does Density Stack teach? Density Stack is a Matter game: Steer falling blocks into a tank of liquid layers — each sinks through lighter liquids and rests on the first denser one, so work out mass ÷ volume and fill a layer to clear it. States, dissolving, mixtures and density — what stuff is made of.
What grade is Density Stack for? Density Stack is built for Grades 6–8 (ages 11–14). Every level follows predict → observe → explain, so younger players can reason qualitatively while older ones work the numbers.
How do you play Density Stack? Make a prediction, run the experiment on screen and watch the real result, then explain the rule you saw. A wrong prediction is never a game-over — the game shows what actually happened and lets you try again.
Is Density Stack free? Yes. Density Stack is free, with no ads and no sign-up, and runs in the browser on a phone, tablet or computer.