Kakuro

Expert kakuro uses 11×11 grids — the largest pure-deduction tier — with many entries. The number of cells and constraints demands systematic candidate tracking. You can't hold it all in your head.

Use notes mode to write down every candidate for every cell. Work through entries methodically: filter combinations, apply cross-entry elimination, look for naked singles (cells with only one candidate). Each placement triggers a chain of eliminations in crossing entries.

Expert puzzles reward patience. When you're ready for the ultimate test, try Einstein.