This guide is mapped to “What is the question mark” in the checked version. If Level 278 shows another question, use the text and screenshot rather than the number alone.
Answer and walkthrough
The question is “What is the question mark.” 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 278 quick answer: Sum the numbers at the corners of the left triangle (4 + 5 + 10 = 19) and enter '19'.
Step-by-step walkthrough
Read the trick
Before spending a hint, compare the exact wording of “What is the question mark” with everything you can tap, drag, or change on screen.
Important notes
- Enter only the verified value, then use the on-screen confirmation control when the puzzle provides one.
- 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
Sum the numbers at the corners of the left triangle (4 + 5 + 10 = 19) and enter '19'. 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 278: Sum the numbers at the corners of the left triangle (4 + 5 + 10 = 19) and enter '19'.
What the dedicated video shows
This short clip shows the exact question “What is the question mark,” 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
Sum the numbers at the corners of the left triangle (4 + 5 + 10 = 19) and enter '19'. 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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