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DOPPELGANGER
– Every row, column, and box contains the digit 0 always, as well as seven out of the eight digits from 1 to 8 (ie, it's missing one digit that is not 0)
– No two row, no two column, and no two box may be missing the same digit
– For each 0 in the grid, the digits missing in its row, its column, and its box must be three different digits
(A zero always acts as itself – ie, the lowest possible value – regardless of what digits it's replacing in its box, row and column)

GERMAN WHISPERS (gray)
– Adjacent digits along a gray line must have a difference of at least 5

REGION SUMS (blue)
– Digits along a blue line have an equal sum within each box this line passes through. Different lines may have different sums

RENBANS (red)
– Digits connected by a red line must be consecutive

CTRL + z CTRL + y Erase elements that belongs to the selected mode Erase problem or solution grid

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Mode: Sudoku

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