This is a genuine quantum computer, the real math, small enough to run in your browser. The glowing orbs are qubits. The ring of spokes is the full quantum state: every possible answer at once, each with a height (how likely) and a color (its phase).
Gates rotate and mix the qubits. A Hadamard (H) puts one into superposition, both 0 and 1 until asked. CNOT ties two together into entanglement: do that and watch the two orbs go hazy - because the information stops living in either one and starts living in the thread between them. That haze is real; a maximally entangled qubit has no definite state of its own.
Tap a single orb to measure just that qubit. If it is entangled, its partner decides in the same instant, however far apart they would be. Einstein hated this. He lost.
Observe collapses the whole machine to one answer, chosen by the real probabilities. Flip on Many Worlds and instead of collapsing, every outcome survives as its own faint branch. Nobody knows which story is true.
Try the presets. Make a Bell pair, then measure one half.