Brain Test 3 Level 121: Why is the hound barking at that wall?
Brain Test 3 Level 121
Screenshots

Quick Answer
Drag Thor's hammer up into the beam of light and drop it to reveal a secret portal on the wall.
Skills Tested
Step-by-Step Solution
- 1) Notice the hound barking at the wall.
- 2) Pick up Thor's hammer.
- 3) Drag the hammer up into the beam of light.
- 4) Drop the hammer to reveal the secret portal on the wall.
Hint
Reveal a hint
Combine the hammer with the beam of light, then drop it where the light falls on the wall.
Why It Works
The level links the hammer, the light beam, and the wall into a single sequence. Dropping the hammer in the light reveals the hidden portal, answering why the dog barked.
Frequently asked questions
How do I solve Brain Test 3 level 121?
Drop Thor's hammer into the beam of light to reveal the secret portal on the wall.
What is the answer to Brain Test 3 level 121?
Drag the hammer up into the light beam and release it to show the hidden wall portal.
Why is the dog barking in Brain Test 3 level 121?
The hound senses the hidden portal on the wall, which you reveal with the hammer and light.
How do I reveal the portal in Brain Test 3 level 121?
Combine the hammer with the beam of light and drop it to open the secret portal.
Why do I use the beam of light in Brain Test 3 level 121?
The light beam is the trigger that reveals the portal when the hammer passes through it.
Is there a video walkthrough for Brain Test 3 level 121?
Yes, the embedded video shows the hammer and light trick for Brain Test 3 level 121.