Blades spin in place on standby. Run drives them together and freezes the rig at first contact — or calls a clean miss if they pass. Space bar runs/resets.
Hidden compartment. DISC B has been randomized and locked in. Build DISC A within the spec limits below, then win the undercut to clear the clash.
Drag control points to bend the outline. Click an empty cell to add a point, double-click a point to remove it. Right-click (or press and hold) a point to toggle it between a smooth curve (●) and a sharp corner (■).