How to Extract a Dionesium Sample

Stuck on the Dionesium Sample puzzle in Gotham Knights? This guide breaks down exactly which Core Sample and chemical to use to progress through the Chelsea Tunnel.

Alright, so you've hit a bit of a puzzle in the Chelsea Tunnel, huh? Don't sweat it, figuring out how to extract that Dionesium Sample is pretty straightforward once you know what you're looking for. Let's get you through this.

The Puzzle: You'll be presented with a few different 'Core Samples' and a selection of chemicals. You need to pick the right combination to proceed.

Which Sample? You've got a few options like Core Sample [10342-QUA], Core Sample [10063-MAR], Core Sample [10588-COS], Core Sample [222-COS], and Core Sample [10400-MAG]. The game pretty much tells you the answer here. Look closely at the samples; most of them have notes or have already been tampered with. The one you want is Core Sample [10588-COS]. It's the pristine one, the one that hasn't been messed with, and the one the monitor will hint at.

Which Chemical? For the chemical, you'll see options like Carbonic Acid, Cyanide Solution, Sulfuric Acid, and Ammonium Nitrate. Again, the monitor is your friend here. It'll point you towards the correct one, which is Sulfuric Acid. Some previous researcher basically did the hard work for you and figured out it's the ideal treatment.

How to Do It: So, to solve this, you just need to select Core Sample [10588-COS] and the container of sulfuric acid. Once both are highlighted, you'll need to press the [Interact] button (it's usually [R1]/[RB] or [Square]/[X], check your on-screen prompts!) to confirm your choices and solve the puzzle.