Santa's Sleigh
by FullDeck & Missing a Few Cards
- Kropki dots
- Whisper lines
- Modular lines
- Entropic lines
- German whisper
The brief
Normal sudoku rules apply: every row, column, and box must contain a complete set of the digits 1-9. The sleigh (teal line) is a modular line: every three contiguous digits on the line must contain one digit from each of {147}, {258}, and {369}. The runner of the sleigh (peach line) is an entropic line: every three contiguous digits on the line must contain one digit from each of {123}, {456}, {789}. Santa's bag of gifts (green line) is a German whispers line: consecutive digits along the line must differ by at least five. Digits on either side of a snowflake (white dot) form a consecutive pair. Digits on either side of the black dots attaching the runner to the sleigh are in a 1:2 ratio. Not all possible dots are given.