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Up to 256 blocks across. Generators differ by a block on some rows depending on their rounding. Everything is calculated in your browser; nothing you type is uploaded.

A block is placed when its centre lies inside the ideal shape. Thin outlines keep blocks with a side neighbour outside the shape; thick outlines also check diagonals, so there are no diagonal gaps.

A 21-block thin circle needs 56 blocks: row 1 covers columns 8–14 and rows 8–14 have one block at each side.