Fill Pattern Rules

How shape fills (empty, half-filled, filled) change across the matrix.

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How shape fills (empty, half-filled, filled) change across the matrix.

Fill rules determine whether shapes are empty (outline only), half-filled (partial shading), or fully filled (solid). Like other attributes, fill can be constant across the grid or progress systematically across rows or columns. Fill patterns often create visual rhythm that helps identify the correct answer.

fill(cell) = empty | half | filled, following position rule

Row pattern: Each row shows empty → half → filled
Column pattern: Each column shows empty → half → filled
All different per column: Each column has one of each fill

How to recognize it

Examine fill states across each row
Examine fill states down each column
Look for the empty→half→filled progression
Fill is independent of shape and size

Common mistakes

Confusing 'half' with 'empty' or 'filled'
Missing fill patterns while focused on shape
Not checking both row and column directions

Step-by-step walkthrough

In a 3x3 matrix, fill progresses across each row as empty, half-filled, filled. Row 3 shows: empty square, half-filled square, ?. What fill belongs in the missing cell?

Identify the fill pattern across rows
Verify the pattern in rows 1 and 2
Apply the pattern to row 3
The third position completes the fill sequence

Answer: Filled square

Practice guidance

Pattern Recognition