Brain Test 5 Level 51

Overview

This is a digit-cycling level spread across three notebook pages. Each page shows a target number at the top and a row of starting digits in the center. Your job is to change each starting digit to match the target by tapping on it; every tap increments that digit by one, and digits wrap around from 9 back to 0. The first round asks you to turn 1-3-1 into 353, the second round asks you to reach 3844 from 3242, and the final round asks you to reach 35866. The overall approach is to work left to right, tapping each digit until it matches the corresponding digit in the target number.

• Difficulty: Easy
• Estimated moves: 25

Step-by-Step Solution

1. On the first page, read the target number and the starting number. For the opening round, the starting digits are 1, 3, 1 and the target is 353. Compare each digit position one by one. The first digit needs to go from 1 to 3, which takes two taps. The second digit needs to go from 3 to 5, which takes two taps. The third digit stays at 1 and matches the target 3... wait, the third digit needs to go from 1 to 3 as well. Tap each digit column until all three match.
2. Move to the second page, which asks you to get to 3844 from the starting digits 3, 2, 4, 2. The first digit is already 3 and matches the target, so leave it alone. The second digit needs to go from 2 to 8, which takes six taps. The third digit is already 4 and matches. The fourth digit needs to go from 2 to 4, which takes two taps. Work through each column.
3. On the final page, the target is 35866. Starting digits may differ. Tap the first digit until it shows 3, the second until it shows 5, the third until it shows 8, and the fourth and fifth until they both show 6.
4. If you overshoot a digit, keep tapping — the digit wraps around from 9 to 0, so you can cycle back to the number you want.
5. When all digits match the target number exactly, a large green checkmark appears over the middle digit to confirm the level is complete.

Strategy & Reasoning

The puzzle is simple in concept but easy to rush through incorrectly. Each digit column is independent: tapping one column only changes that digit, so you can work on columns in any order. The trap is losing count of how many times you have tapped a digit, especially when cycling through numbers 0 through 9. The optimal approach is to read the target digit for each position, calculate the number of taps needed, and tap deliberately rather than tapping rapidly.
Alternatives like tapping all columns simultaneously do not work because each tap only affects one digit. Some players try to drag the digits, but the interaction is tap-only. The checkmark appears the moment the last digit matches, so there is no submit button — you simply keep tapping until the number is right.

Tips & Common Mistakes

• Do not rush the taps; it is easy to lose count and overshoot, and you will have to cycle all the way back around to fix it.
• Do not forget that digits wrap from 9 to 0; if you overshoot, you do not need to restart, just keep tapping to cycle back.
• Do not tap the wrong column; each digit only responds to its own tap zone, so aim carefully at the number you want to change.