At the start of The Dead End, there is a secret chest and it requires a code, this guide will show you the secret code and explain where to find it.
When you start the game, and go to the right, there is a room with an open chest, a closed chest, and a chest with a lock (pictured with a chain over it).
When you examine it, it tells you it’s a thank you gift for beta testing the game. Too bad that we’ve “only” bought it!
Nevertheless, the code is 3739
The chest contains 3 potions, 3 scrolls of travel, 1 antidote and 2000G. Nothing major, but anyway!