Brain Test Level 605: Fix the problem.
Brain Test Level 605
Screenshots

Quick Answer
Drag the flat tire off the car, then replace it with the donut from the donut sign.
Skills Tested
Step-by-Step Solution
- 1) Look at the car and find the flat tire.
- 2) Drag the flat tire off the car.
- 3) Take the donut from the donut sign.
- 4) Place the donut where the flat tire was to fix the car.
Hint
Reveal a hint
Look for a round object that could act as a replacement wheel.
Why It Works
The flat tire needs to be swapped for a usable one, and the donut hanging on the sign is the only round substitute on screen. Replacing the flat tire with the donut lets the car roll again.
Frequently asked questions
How do I fix the car in Brain Test level 605?
Drag the flat tire off the car and replace it with the donut from the donut sign.
What is the answer to Brain Test level 605?
Remove the flat tire from the car and put the donut from the sign in its place.
Where does the replacement wheel come from in Brain Test level 605?
The donut shown on the donut sign becomes the replacement wheel for the car.
What is the trick in Brain Test level 605?
The trick is treating the round donut as a spare tire since no real wheel is available.
Why is the donut used in Brain Test level 605?
Because the donut is round and fits the axle, it substitutes for the flat tire to fix the car.
Is there a video walkthrough for Brain Test level 605?
Yes, the embedded video shows the flat tire being removed and the donut fitted in its place.