This guide is mapped to “How to build a tower” in the checked version. If Level 138 shows another question, use the text and screenshot rather than the number alone.
Answer and walkthrough
The question is “How to build a tower.” Its trick depends on how the wording, movable artwork, or screen controls behave. The concise answer appears first; reveal the three steps only if you need more detail.
Brain Test Level 138 quick answer: Stack the blocks on top of each other: dark grey on the bottom, light grey in the middle, and brown on top.
Step-by-step walkthrough
Read the trick
Before spending a hint, compare the exact wording of “How to build a tower” with everything you can tap, drag, or change on screen.
Important notes
- Perform the described action once and wait for the game to register the changed state.
- Do not add extra actions after the verified answer; many Brain Test puzzles punish an otherwise sensible second move.
- Question order can change after an update, so match the wording and screenshot instead of trusting the number alone.
- Restarting the level restores moved objects and counters if an earlier experiment changed the puzzle state.
Why this answer works
Stack the blocks on top of each other: dark grey on the bottom, light grey in the middle, and brown on top. The puzzle rewards attention to the exact wording and to objects that can be moved or tapped, not a complicated calculation.
Useful solving habits
- 1Read the prompt literally before applying real-world assumptions.
- 2Test whether text, labels, and decorative objects are interactive.
- 3Use the simplest gesture that matches the verified answer.
- 4Compare the success frame with the screenshot if the result is unclear.
Collectibles and completion
There are no optional collectibles required to finish this puzzle; completing the verified action is enough.
Level 138: Stack the blocks on top of each other: dark grey on the bottom, light grey in the middle, and brown on top.
What the dedicated video shows
This short clip shows the exact question “How to build a tower,” the required interaction, and the green completion confirmation. It is embedded through YouTube's privacy-enhanced domain and loads only after you press the button.
What to watch closely
Stack the blocks on top of each other: dark grey on the bottom, light grey in the middle, and brown on top. Watch the pointer or finger position rather than only the final screen, because the important clue is often which object moves or which word receives the tap.
Quick feedback
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