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DOPPELGANGER
– Every row, column, and box contains the digit 0 always, as well as eight out of the nine digits from 1 to 9 (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

DOUBLE ARROWS
– The sum of the digits along each grey line connecting two circles is equal to the sum of the digits in these circles
– Digits may repeat on double arrows if allowed by other rules

GROUP LINES
– Numbers on an orange line are the same type: either all even or all odd (0 is even)

INDEX LINES
– Each cell on light blue line has a position number: the square is position 0, and it counts up from there
– If a digit with value V is at position P, then a digit with value P must be at position V
– Digits may not repeat along an index line

KROPKI LINES
– Adjacent digits along a purple line must be in a 1:2 ratio

X-SUMS
– Clues outside the grid show the sum of the first X digits from that direction, where X is the first of those digits
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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