Post · iPhone Duo ideaClosedOpen

Sudoku Unlimited: a round keypad beside the grid when open

Farid Ahmad's Sudoku Unlimited Puzzles. Closed, the grid fills the cover with two rows of number keys below. Open flat, the grid sits on the left and a round three-by-three keypad on the right; turned upright, the keys go back below.

By Farid Ahmad Added Original on x.com

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