Zero star puzzle.
Normal sudoku rules apply. Place the digits 1-4 once each in every row, column, and 2x2 box.
Killer: digits inside a caged region must not repeat and sum to the total shown in the corner.
Palindrome: digits along a grey line read the same forwards and backwards.
Kropki: digits separated by a black dot are in a 1:2 ratio (one digit is double the other).
Cells connected by a V sum to 5. Not all Vs are given.
Solve in VariantDoku (iOS) or on SudokuPad.
Solution code: Enter the digits of row 1.
on 26. May 2026, 14:26 by BronzePhosphor
Thank you for the puzzle!
on 25. May 2026, 23:25 by macintux
Thank you for continuing to make these.