You are most likely to encounter this puzzle while completing the nonlethal branch of the “Samizdat” side-mission, but you can access this puzzle at any point once you first arrive in Prague.

The puzzle is found in the CEO office on the third floor of the Palisade Property Bank. Near the CEO’s desk, there are three lightboxes on a revolving disc. You can interact with the forward-facing white block and spin the disc around — the goal is to light up all three blocks at once.

Solving the puzzle unlocks the CEO’s hidden office room which contains a praxis kit and one eBook.

The eBook is required if you’re going for the eBooks collectible achievement.

This is a complicated puzzle. Here are the basics; you can spin the table, whichever block is facing forward can be interacted with. It will go down after each interaction until it resets. The left block will always go down, the right block will always go up. To solve the puzzle, you’ll need to match this configuration:

Left – 2 Blocks
Center – 1 Block
Right – 3 Blocks

Here are the exact moves you’ll need to make to efficiently complete this puzzle from the default position. If you adjust it, these steps won’t work. Reset the puzzle by reloading the Prague map.

Tap Interact
Hold Interact
Tap Interact
Hold Interact
Hold Interact
Tap Interact

Follow these steps to complete the puzzle in the least amount of steps. The eBook is on a table opposite the desk, and the Praxis Kit is located in a safe hidden behind a painting on the right wall just as you enter.

I hope this guide helped.