This is a very simple puzzle, you just have to be really quick!
Just keep clicking the switches in order to keep the lights green until the orb is fully powered. if you are too slow then the orb will start losing power.
Clicking the switches with 2 players will be a lot easier, so bring a friend if you can!
Watch the orb, the power lights will eventually reach it and you will then have to click the orb to make the chest appear