? HALF PRICE SALE FOR A LIMITED TIME ?Sudoku Master is the must-have game for hardcore addicts. Looking for real challenge? Try our super hard sudokus that require skill sets ranging from 'naked single' to 'advanced chain techniques'. Our sophisticate resolver can show the solution logic step by step, it is a great helper to improve your skill for every level of players.Sudoku Master supports many more human solving techniques than most of other apps in the store. Here is the complete list:- Easy: Naked Single, Hidden Single- Medium: Locked Candidate- Hard: Naked/Hidden subset (Naked/Hidden twin, triplet, etc)- Advanced: X-Wing, Skyscraper, 2-Strings Kite- Fendish: Empty Rectangle, Turbot Fish, Sword Fish, Jelly Fish, Finned X Wing- Fendish +: XY Wing, XYZ Wing, W Wing, Complex Fish, Finned Fish- Fendish ++: Remote Pair, X Chain, XY ChainHighlight Features:- All sudokus are solvable by logic alone- Show incorrect option- Smart notes, smart buttons: keep you focus on reasoning- Auto save game state on exit- Five themes: Paper, Green, Blue, Coffee, Brown