Diagonal and Corner Patterns

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Rules that apply to diagonal lines or corner cells of the matrix.

Beyond rows and columns, matrices can have diagonal rules. The main diagonal runs from top-left to bottom-right; the anti-diagonal runs from top-right to bottom-left. Corner rules specifically match the four corner cells. These patterns are typically found in harder puzzles and require looking beyond the obvious row/column structure.

Diagonal: cells[0,0], cells[1,1], cells[2,2] share attribute. Corners: cells at (0,0), (0,2), (2,0), (2,2) share attribute.

• Diagonal shape: Top-left, center, bottom-right all have same shape
• Anti-diagonal fill: Top-right, center, bottom-left all have same fill
• Corners same: All four corner cells have matching shapes

How to recognize it

• After checking rows and columns, examine the diagonals
• Compare the four corner cells for matching attributes
• Diagonal rules often combine with row/column rules
• These patterns appear in harder difficulty levels

Common mistakes

• Only checking rows and columns, missing diagonal patterns
• Confusing main diagonal with anti-diagonal
• Forgetting that diagonal rules can apply to any attribute

Practice guidance

Pattern Recognition