Superposition

Place quantum gates to rotate your qubits to exactly the right state on the Bloch sphere — then leave no uncertainty for the final measurement to ruin.

How to play

Each level asks you to transform the qubits into a target state by building a short gate circuit. A Bloch-sphere view shows where your state points. The catch is the measurement step: it collapses the state probabilistically, so you only win if you removed all uncertainty first.

• Select gates and place them onto the circuit strip (up to eight gates).
• For a controlled gate, choose the control qubit when prompted.
• Use the Bloch sphere and probability readouts to confirm your state hit the target.
• Run the measurement — if anything was left in superposition, it may collapse the wrong way.

Controls

• Desktop: click a gate to select it, click the circuit to place it, then click Measure; switch Daily/Practice in the bar.
• Phone & tablet: tap gates and the circuit to build, then tap Measure — fully touch-friendly.

Tips & strategy

• Aim to land the state on a pole of the Bloch sphere so the probabilities read a clean 0 or 1 before measuring.
• Order matters — quantum gates don't commute, so the same gates in a different sequence give a different state.
• Keep the circuit short; every extra gate is another chance to drift off the target.

What you'll learn

Superposition makes the strange logic of quantum computing tangible, from gate rotations to irreversible measurement.

• Skills: quantum computing, qubits and gates, superposition
• Best for: advanced high school / college
• For parents & teachers: the logic of quantum computing.

About Superposition

Superposition makes the strange logic of quantum computing tangible, from gate rotations to the irreversible collapse of a measurement. It's an original, free browser game with daily and practice levels that ramp through quantum-circuit tiers.

A free, original browser game on PlayPendium — no download, no install. Browse all games →