SPOOKY SHACK

The shop is shut, the lights are off, and something in the 200-in-1 is still running.

0 OF 6 CHAPTERS · MISSION CLOSED

LAUNCH WHEN READY

CHAPTER 1 OF 6 · AHEAD

Two Lamps Taking Turns

Something is out past the window and there are two of it, and it blinks. Not together — one, then the other. Build a pair of lamps that take turns without anybody telling them to.

Level 1 · № 3 · Two-transistor flasher