Techniques
11
Every technique the hints use is here.
Sudoku Logic guideOpen guideLearn the basics, notes, highlights, and logic hints.Naked SinglenakedSingleOnly one digit is left that can go in a cellnot yetHidden SinglehiddenSingleOnly one cell in a house can hold that digitnot yetPointinglockedPointingCandidates confined to one line in a box clear the rest of that linenot yetClaiminglockedClaimingCandidates confined to one box in a line clear the rest of that boxnot yetNaked PairnakedPairTwo cells hold the same two candidates and clear the rest of the housenot yetHidden PairhiddenPairTwo digits fit only two cells, clearing the other candidates therenot yetNaked TriplenakedTripleThree cells share three candidates and clear the rest of the housenot yetX-WingxWingA digit sits in the same two columns on two rows, clearing those columnsnot yetSwordfishswordfishThree lines confine a digit to the same three crossing linesnot yetSkyscraperskyscraperTwo strong links clear a candidate seen by both far endsnot yet2-String KitetwoStringKiteA row and column strong link meet in a box and clear a candidatenot yet