Puzzle#42: Little Killer Sudoku on December 31, 2017 little killer +0 variants little killer variants
Puzzle#37: Palindrome Sudoku on December 25, 2017 Birthday palindrome +0 variants Birthday palindrome variants
Puzzle#26: Little Killer Sudoku on December 09, 2017 little killer math variants +0 variants little killer math variants variants
Puzzle#24: X-Sums Sudoku on December 04, 2017 math variants variants +0 xsums math variants variants xsums