SudoKanard

 Between Killer Sudoku Classic Sudoku rules apply. The digits in a cage must sum to the number printed in its corner. Digits may not repeat within a cage. Cells along lines between two filled circles must have values strictly between those in the circles. Solve on Penpa: https://tinyurl.com/yahtleg3 Solve on CtC: https://bit.ly/3qKzE8e Solution on video: https://www.youtube.com/watch?v=_-piQrp8pp4

 Between Quadruple Sudoku Standard Sudoku rules apply. Digits in a small circle must appear at least once in the surrounding four cells. Digits on a gray line must lie strictly between the digits in the grey circles at the ends of the line. Solve on Penpa: https://tinyurl.com/y8fy62ug Solve on CtC:  https://bit.ly/3NlIS4A