Daily Hard Killer Sudoku

The daily hard killer sudoku is where pure logic meets real cage-sum challenge. Cages average 3 cells and the sums stop dropping hints immediately — most moves come from combining cage-combination reasoning with classic sudoku tools (hidden pairs, pointing pairs, X-wing). Mastering the 45 rule pays its biggest dividend here: enumerating innies and outies across a box that's mostly covered by partial cages lets you crack open multi-cage tangles in one inference. Sessions average 25-45 minutes; the toughest puzzles can reach an hour. A fresh puzzle every visit means the daily hard killer never repeats its tricks. Show Candidates is your friend on hard killer — listing every digit that can legally sit in a cell makes the cage combinations visible. Create a free account to track your daily hard killer times against the all-time leaderboard.