Killer Sudoku From Scratch - Puzzle Genius

A Sudoku Genius Recommended A Puzzle

Genius Killer Sudoku Puzzle - Can YOU Solve It?

Ridiculous Killer Sudoku - Can You Solve It?!

Sudoku Puzzles Book - Evil Killer : 100 Hard & Extremely Hard Books for Adult 9781544083087

Shop - Puzzle Genius

Killer Sudoku Sarah Rubin Books

Killer Sudoku online - Solve daily killer sudoku puzzles

Killer Sudoku - Puzzle Games by Guru Smart Holding Limited

Sudoku From Scratch 3 - Puzzle Genius

Killer sudoku with 2 pictures (simplified notes vs all my notes). Can anyone see what the next step is? I'm extremely stuck : r/sudoku