Fill the sign. Drag the glass blocks from the tray into the sign until every cell is filled. The moment the last one snaps in, the sign lights up.
Tap a block to turn it (in the tray or on the sign). With a mouse you can also press R while dragging. Drag a block off the sign to send it back.
Bulbs (from sign 3): a socket lights when a block of its own colour covers it. Light every bulb for a Full Glow: double points.
The clock starts at 90 s. Each sign solved adds 20 s (15 s from sign 9), each bulb 5 s more. If it empties you lose a fuse, see the Full Glow answer and move on. Lose 3 fuses and the run ends.
12 signs per run, from small ones to big ones with a spare block and steel bolts. A finished sign turns into a neon picture of the real thing.
Spark places one block of a Full Glow for you: 3 per run, −10 s and −300 points each. Undo is unlimited.
Keys: R turn · Z undo · S spark · P pause · M mute