Tracking down the briefcase code in Grounded 2 is one of the biggest puzzles I've come across so far in the game. While scaling the bug-infested picnic table, you'll find this colossal case resting on ...

Grounded 2 features a massive, open, explorable world that has some interesting use of day-to-day objects. One of them is a Briefcase at the Picnic Table region that contains a lot of free loot.