Mark one of eight
A Grover oracle for a three-qubit search: put all three qubits into equal superposition, then flip the sign of the |101⟩ amplitude — and only that one. Every bar stays at 12.5%; the grader checks amplitudes. The catch: the only multi-controlled gate in the palette fires when its controls read |1⟩, and the state you are marking has a 0 in the middle. Par is 8.
Stuck on the concept? Read Grover's Search.
Heads up: this one is graded on amplitudes, not the histogram. A correct oracle leaves every bar exactly where it is — the two charts above will match long before you are done.
Select a gate to see what it does, then tap a wire — or Tab to a wire and press Enter — to place it.
Pick a gate, then tap a cell — or Tab into the grid and use the arrow keys and Enter — to place it.
Generate a fresh target state drill at this difficulty. Every generated puzzle is verified solvable by execution before you see it — the generator runs its own solution through the same simulator and grader that will judge yours.