Brain Test 5 Level 59

Overview

This is a multi-round puzzle level spread across three notebook pages. Some pages present an arithmetic grid challenge where you must fill in boxes so that every row and column equation holds, with column totals given as 25, 20, and a division result of 31. Another page reads "Light them up." and shows a 3×3 grid of numbered buttons from 1 to 9, with an arrow cursor icon at the top. The overall approach is to solve each round's puzzle: on arithmetic pages you deduce the missing digits from the row and column constraints, and on light-up pages you tap the correct numbers in sequence to turn them all on.

• Difficulty: Hard
• Estimated moves: 15

Step-by-Step Solution

1. On the arithmetic page, identify the given totals. One column must sum to 25, another to 20, and one division row gives 124 divided by 4 equals 31. Write down these constraints and work through each row and column systematically. Start with the column that has the most known cells, since it gives you the fewest unknowns to solve for.
2. For each row, check whether the operation is addition, subtraction, multiplication, or division. Use the column totals to cross-verify: a digit that satisfies one row must also produce the correct total in its column. If a digit gives the wrong column sum, swap it for the next candidate.
3. On the light-up page, look at the arrow icon at the top. It indicates the direction or starting point. Tap the numbered buttons in the correct order to light them up. The number grid shows 1 through 9 arranged in three rows. Follow the pattern implied by the arrow — for example, starting at the arrow position and moving in the direction it points.
4. If you tap a wrong number, it turns red and shows an X at the top. You have a limited number of attempts, so think before tapping. Retry the pattern from the start.
5. When every row and column equation checks out and all lights are correctly activated, a green checkmark appears. The next round loads automatically.

Strategy & Reasoning

The arithmetic pages are classic constraint-satisfaction puzzles. Each digit appears exactly once, and both the row equation and the column total must be satisfied. The optimal strategy is to solve the most constrained line first — the row or column with the most numbers already filled in — then propagate that result to solve the adjacent lines. Alternatives like guessing random digits waste attempts because you only have five red X markers before the level locks.
The light-up page is a pattern-recognition test. The arrow tells you where to start and which direction to move. Do not tap numbers in numerical order; the pattern is spatial, not sequential. The grid layout matters more than the digit values themselves. Remember that each round has a different layout, so you cannot memorize positions across rounds.

Tips & Common Mistakes

• Do not guess digits on the arithmetic page; work systematically from the column with the most known values and cross-verify every answer.
• Do not tap numbers in simple ascending order on the light-up page; follow the arrow direction instead.
• Do not forget to check both row and column constraints; a digit that works for one row may break a column total, so always verify after each placement.