Biodiversity Lab is an area inside the Research and Development level in Poppy Playtime: Chapter 5. At this level, you'll come across a very interesting, but also very hard, puzzle involving two electric boxes, with no hint on how to solve it.
Seriously, the game won't tell you a thing; everything you'll have to figure out on your own, including what to do with the electric boxes and where and how to use them, and once you manage to figure out all that, you'll probably grow a huge question mark above your head: "What the hell am I supposed to do now?"
If those questions are troubling you and you cannot figure out how to solve this puzzle and leave this area, do not worry; you're not the only one. It took us almost an hour to figure out how to solve this very difficult puzzle.
How to Solve the Electric Box Puzzle in Biodiversity Lab
Before you enter the room with the actual puzzle, you'll find yourself in the other room with a whiteboard featuring a message about the broken vending machine. Next to the whiteboard, Glowby will warn you about something hidden. Engage the black light lamp, and you'll notice an arrow drawn on one of the lockers.
Follow the arrow, and jump on the stacked boxes to reach the next room. However, before doing that, just next to the whiteboard, you'll locate one of two electric boxes required to solve this puzzle. Take it with one of your hands by pressing the hand button while aiming towards it, and then pressing it and holding again to pick it up.
Bring this box to the other room, and you'll notice two holes on the wall to the right fit for the box you're holding. Aim towards either hole and press the hand button again to install the box. The other box lies on the floor in front of the wall. Pick this one up as well and install it in the other hole.
Now aim with either hand towards a small coil located between the two boxes. If you did everything correctly, the cable on the attached hand will glow. Now all you need to do is connect two big coils with the electric symbol on them and connect them with the other small coil on the other side of the room. It all sounds simple, but trust us, it is anything but.
The solution is to attach a hand to the first coil and connect yourself to the electricity. Now, crouch and lead the cable to touch the first big coil box. Once you do, the electricity sign will glow. Lead the cable around the big coil and bring it to the other big coil box, and do all this while crouching to make sure the cable connects to both coil boxes.
Keep leading the cable, and once both signs on the boxes are lit, connect the other hand to the second small coil on the opposite wall. Once you do that, nearby pipes will explode and open the door. Go through the door to trigger a cutscene.
You can also watch a video guide we've posted above to see firsthand how we solved this intricate puzzle.
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