How to play
The connections are hidden. Choose which switches to turn on, then press Run electricity and observe which lamps light up.
If you have tests left, press Next run and choose your switches for the next test.
On levels with several tests, the dots beneath each switch and lamp record the results from left to right. A filled dot means the switch was on or the lamp was lit; an empty dot means it was off.
After the final test, press Start answering. Tap a switch, then the lamp you think it controls. Match every switch, then press Check.
To change a match, select the switch again and choose another lamp. Choosing a lamp already matched to another switch removes its previous connection.
Rules
- Each switch controls exactly one lamp, and each lamp is controlled by exactly one switch.
- The hidden connections stay the same throughout an attempt.
- You may turn on any number of switches before each test, but you have only the number of tests shown on the level.
- The puzzle is solved only when every switch is matched to the correct lamp.
An incorrect answer resets the puzzle for another attempt. A correct answer stays on screen.
Choose a level
Start from the beginning or pick up where you left off.