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DOPPELGANGER
– Every row, column, and region contains the digit 0 always, as well as six out of the seven digits from 1 to 7 (ie, it's missing one digit that is not 0)
– No two row, no two column, and no two region may be missing the same digit
– For each 0 in the grid, the digits missing in its row, its column, and its region must be three different digits
(And note that a zero always acts as itself – ie, the lowest possible value – regardless of what digits it's replacing in its region, row and column)

GERMAN WHISPERS
– Adjacent digits along a green line must have a difference of at least 5

REGION SUMS
– The digits along the blue line have an equal sum within each region the line passes through (the branchings are purely for aesthetic reasons; no cell is counted twice)

RENBANS
– Digits along a red line must form a series of non-repeating consecutive digits in any order
CTRL + z CTRL + y Erase elements that belongs to the selected mode Erase problem or solution grid

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Mode: Number

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