Brain Find Level 37

Overview

Level 37, subtitled "Where did the cockroaches go?", hides a cockroach inside an everyday object. The whole scene is a single blue thermal bottle / water tumbler standing upright, with a closed lid and a light wrist strap hanging off its side. The circular goal icon shows a cockroach. There is nothing else on screen, so the puzzle is a search: the cockroaches have vanished from sight, and you must work out where they are concealed. The core mechanic is opening the sealed container — the obvious hiding spot is inside the closed bottle. The overall approach is to remove the bottle's lid and look inside, where the cockroach is hiding.

• Difficulty: Easy
• Estimated moves: 1

Step-by-Step Solution

1. Look at the sealed bottle. The title "Where did the cockroaches go?" is at the top, and the only object on screen is the blue thermos, its lid firmly closed. The goal icon at the bottom shows a cockroach, so you know the bugs are somewhere you have not yet looked.

1. Rule out the empty space around the bottle. There are no cracks, gaps, or hidden corners on the plain background, and the wrist strap on the side is just decoration. The only enclosed space on screen is inside the bottle itself, which the closed lid hides from view.

1. Open the bottle by removing its lid. Twist or drag the cap off the top of the thermos so the opening is exposed. As the lid comes away and moves off to the side, the mouth of the bottle is revealed.

1. Look inside the open bottle. The cockroach was hiding in the dark interior, and once the lid is off it is visible — in the intermediate frame a cockroach is crawling out of the open bottle mouth, right where the lid used to seal.

1. With the cockroach found inside the bottle, the level completes. A yellow success screen appears with a large "Good" ribbon and the teasing message "Eh, I just had a drink of water!", showing the cockroach inside the circular frame. The joke implies the bottle you drink from was harboring the bug. The level is complete.

Strategy & Reasoning

The level relies on a familiar "it's in the last place you look" expectation. When asked where the cockroaches went, your first instinct is to scan the background and peek around the bottle, because the bugs were presumably somewhere visible a moment ago. But the designers leave the background completely empty, which rules out every surface hiding spot and forces you to consider the one closed container.

The thermos is drawn as fully sealed on purpose: a closed lid means a dark interior that cannot be inspected without opening it. This is the core insight — the cockroaches did not run away across the screen; they retreated into the bottle. Once you remove the lid, the bug appears right at the opening, confirming that the sealed interior was the hiding place. The gross payoff line, "I just had a drink of water," lands because the solution reveals that the drinking bottle itself was infested.

Alternative approaches fail for concrete reasons. Tapping the closed bottle does nothing, because the lid stays sealed and you cannot see inside. Looking behind, under, or around the bottle finds nothing, since those areas are bare. Shaking or flipping the bottle without first opening the lid also keeps the bug trapped inside. The single correct move is therefore to take the lid off and reveal the cockroach in the open mouth, which is exactly what the demonstrated solution does.

Tips & Common Mistakes

• Common mistake: searching the background or around the bottle for the cockroach. The empty screen means the bug is not out in the open; it is inside the sealed bottle.
• Common mistake: forgetting to actually open the lid. The cockroach is hidden by the closed cap; removing the lid is the whole solution.
• Common mistake: shaking or tilting the bottle while it is still closed. The bug will not come out until the seal is broken, so open the bottle first.