Sooner or later you might come across the old gold or locked chest that you can't open without opening it in Dark and Darker.
Guide to Opening Dark and Dark Locks
To do this, you'll need an item called a Lockpick. If only it were that easy to find one.
There are two ways to get a Lockpick in Dark and Darker, and both are heavily dependent on RNG: Chests and Monster Drops.
There is no guarantee that you will find a Lockpick, as there are no more static drops. The best way to get them is to increase the difficulty of your game mode by doing high-roller runs or by defeating bosses such as the Skeleton Champion, which has a higher drop chance.