Pressure Parity

Wire two steam valves. Each opens when its + input exceeds its − input. Choose parallel (either open) or series (both open), and satisfy the four pressure tests. Change commission for OR and AND challenges.

Wire two comparative steam valves to implement XOR across four pressure tests. Tap a port to cycle its input.

Tap or click the controls. Keyboard: Tab and Enter/Space operate every button; arrows/WASD move where available, R restarts, Z undoes calm puzzles.

Mistakes remain revisable. Unlimited undo and restart recover deadlocks.