#153 Variant Sudoku Collection

Each row, column, and 3x3 box must contain the digits 1 through 9 Palindrome Sudoku Digits on each line must read the same forward and backward Solve on F-Puzzles https://f-puzzles.com/?id=26jn8vjs

Index Sudoku

Every cell gives the position of N in the row, where N is the column number of that cell

Solve on F-Puzzles https://f-puzzles.com/?id=2bep6284

Extra Regions Sudoku Outlined regions must also contain the digits 1 through 9 Solve on F-Puzzles https://f-puzzles.com/?id=2b2l2v5u

Argyle Sudoku

Digits may not repeat on each line Solve on F-Puzzles https://f-puzzles.com/?id=289v5v3f