The Golden Ace Heist
It is 1957 and the Golden Ace is the richest casino in the north. Your crew has one hour between the end of the late shift and the arrival of the armoured van. Start in the counting room, work out the manager's habits from what he left on his desk, get the combination and open the vault without tripping the alarm.
This room rewards teams who split up and report back. There are three parallel puzzle tracks that meet at the vault door, so larger groups never stand around waiting.