How can i remove this numbers? (Sudoku killer app). : r/sudoku

Daily Killer Sudoku

How do I delete a number entered by mistake? – Killer Sudoku iOS

What am I missing here? I've applied all the rules I know in killer sudoku including both versions of the 45 rule. But regardless I'm still missing something. Probably something obvious, but

Solving sudoku

Killer Sudoku - Sudoku Puzzle - Apps on Google Play

What am I missing here? I've applied all the rules I know in killer sudoku including both versions of the 45 rule. But regardless I'm still missing something. Probably something obvious, but

Killer Sudoku From Scratch - Puzzle Genius

Killer Sudoku From Scratch - Puzzle Genius

How to write a code of Sudoku and Sudoku solver in C from scratch - Quora