In *Control Resonant*, the Urban Fresh Mart cash register puzzle hides a secret hideout in the West Incursion Zone. Solving it contributes to the Backroom Espionage trophy/achievement and provides useful rewards, including an upgrade point and lore collectibles.

The solution is based on the flashing lights of a soda machine. Interact with the machine, count the lights, then enter that number in reverse into the cash register; the resulting code is 1213. Entering it opens a rear wall, revealing the hideout and a health upgrade point.