A branch ATM at "Earth's National Bank" has been pulled off the network for forensic review after a string of unexplained cash-outs. The maintenance interface it exposes was only ever meant for engineers on the branch LAN, but it was left reachable, and it speaks the machine's native hardware language with no authentication worth the name.

The cash dispenser doesn't care about cards, PINs, or transactions. It only cares whether something fluent in its protocol is giving it orders. Evaluate the exposed terminal, learn how its software talks to the hardware, and see if you can convince it to empty every cassette.