A puzzle box I was comissioned to make for Countdown Live Escape Games -- it was a 1-4 player game that would take 30-60 minutes and ran off of four arduinos housed within a military cargo crate. All the mechanisms/triggers/locks etc were self-contained, so it was portable and had that magical feeling of being able to press a button on one side and have a panel pop open on the other.
Some elements: a RFID-sensor activated maglock, a magnet maze, a 3-D printed labyrinth, a keypad, several buttons/switches, and a couple timers/displays.
Pictures shown are all from construction and alpha playtesting. No pictures of final project are available due to contractual obligations.
"Hello. My name is Agent Harrington and I represent a certain underground organization of a criminal nature. We have hired *cough*kidnapped*cough* you all as you are the best cryptologists and safe-crackers in the country. Your task is to pass the defenses contained within this high-security government cargo box and recover the weapon inside. We hijacked a military caravan leaving New Mexico that we believe was transporting extraterrestrial technology – alien tech that the U.S. Government plans to weaponize and deploy against its enemies. If you all are able to uncover this top-secret cargo, we will sell it on the Dark Net, making ourselves – and you all, of course – billionaires. If you fail, you will be disposed of."