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Fill the main 4x4 grid of each puzzle with the digits zero to four (0-4), such that:

- Every box, row and column contains exactly ONE zero ("doppelganger")
- The digits 1 to 4, each taken separately, will be MISSING from exactly ONE box, ONE row and ONE column, where their absence in these three contexts will be filled by THREE DIFFERENT zeros*... The structures outside the grids are there to keep track of which 1-4 digits have been replaced by a zero in these three contexts: 2x2 box = boxes; vertical strip = rows; horizontal strip = columns
- *... ie, a zero CANNOT REPLACE THE SAME DIGIT IN A BOX AND A ROW (OR A COLUMN) AT THE SAME TIME

ARROW SUDOKU RULES: Digits along an arrow sum to the digit in the connected circle. Digits may repeat along an arrow if permitted by the other rules
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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