NN555Latch

Trace the pulse. Read the route. Make every lock movement count.

This short-session logic game places you in front of a living circuit board. A pulse travels through conductors, branches, target nodes, and terminal paths. Your job is to change the locks at the right moment so the pulse reaches each marked node in sequence and settles at the terminal.

Plan before you move
Each board gives you a limited number of lock movements. Watch the current direction, predict the next branch, and choose whether to spend a move now or wait. The board responds to every decision, so the result is clear and traceable rather than random.

Learn through feedback
Target nodes light up as they are reached. A failed route explains whether the pulse entered a closed loop, reached a node out of order, or ran out of available movements. Undo the most recent lock movement, retry the current level, and use the route to refine your plan.

Build a cleaner record
Complete a route with fewer movements to improve its rating. The first chapter introduces the board with a compact set of switches and progressive challenges. Additional levels and rule combinations can be explored as your understanding grows.

Designed for a few focused minutes, with no account and no network connection required. Your best results stay on your device.