Brain Test 5 Level 67

Overview

This is a simple arithmetic puzzle level spread across five notebook pages. Each page presents an addition problem with a colored question mark, and you must type the correct sum using the number buttons at the bottom. The top page asks "What is the red question mark?" with the problem 6 + 7 + 3 + 2 = ?, and the bottom page shows a completed example: 5 + 9 = 14 in blue with a green checkmark. A red X appears next to wrong answers, and a green circle confirms correct ones. The overall approach is to solve each addition problem and enter the result digit by digit.

• Difficulty: Easy
• Estimated moves: 4

Step-by-Step Solution

1. Start with the red question mark problem at the top: 6 + 7 + 3 + 2. Calculate the sum step by step. First add 6 and 7 to get 13. Then add 3 to get 16. Then add 2 to get 18.
2. Enter the answer using the number buttons at the bottom. You need to type the digits "1" and "8" because the result is a two-digit number. Tap the button for 1 first, then the button for 8.
3. If you enter the wrong number, a red X appears next to the input box. You can clear the wrong entry and try again. You have five attempts total shown as circles at the top of the page.
4. After the red question mark is solved, the next page presents a new addition problem. Solve it the same way: add the numbers, then type the result digit by digit. The blue question mark example shows 5 + 9 = 14, which is already completed as a reference.
5. Each correct answer triggers a green checkmark inside the input box. Once all problems on all pages are solved correctly, the level is complete.

Strategy & Reasoning

The puzzle tests basic addition skills. There is no trick or hidden pattern — each problem is straightforward arithmetic. The numbers are chosen so that the sums land on two-digit results, which means you need to press two number buttons per problem. The red X and green checkmark give immediate feedback, so you know right away whether your answer was correct.
The optimal strategy is to calculate carefully rather than rushing. It is easy to make an addition error when working quickly. Break the sum into steps: add the first two numbers, then add the third, then the fourth. Double-check your result before pressing the buttons. Alternatives like guessing random digits waste attempts, and you only have five red X markers before the level locks.

Tips & Common Mistakes

• Do not rush the addition; it is easy to miscalculate 6 + 7 + 3 + 2 if you work too fast. Break it into steps.
• Do not forget to enter both digits for two-digit answers; the result 18 requires pressing both 1 and 8, not just one number.
• Do not confuse the red question mark with the blue one; each problem has its own colored input box, so make sure you are solving the right equation.