There is a circuit board puzzle in Reverse 1999 known as Projector Relay Controller that some players are stuck on and need a solution to. You will come to this during Chapter 4, Level 6 of the game. This stage is The Forest Express. You can tap on the question mark icon to start the puzzle.
Projector Relay Controller Puzzle | Back: 1999
The way you play it is that you have to rotate the circuit wires so that you can connect all the capacitors to the power sources. However, this is easier said than done because if you miss a connection or connect them wrong, you will create a short circuit. Now that you know the basics of this game, here is how to solve the Projector Relay Controller puzzle.
You need to establish the connection as shown in the image above.
If your connection looks like the one pictured above, complete the puzzle and receive 20 Clear Drop as a reward.