MPQ Sudoku 1 has the following build-in solving techniques, covering eight difficulty levels:
Level: Easy
Hidden Single
Naked Single
Level: Medium
Pointing Pair
BoxLine Reduction
Level: Hard
Naked Subsets
Hidden Subsets
Level: Crazy
X-Wing
Swordfish
Multi-value X-Wing
Empty Rectangle
Level: Insane
XY-Wing
Two String Kite
Skyscraper
XYZ-Wing
Simple Coloring
Level: Kamikaze
Jellyfish
WXYZ-Wing
Multi Coloring
Finned X-Wing
Sue-de-Coq
Aligned Pair Exclusion
Unique Rectangle
Avoidable Rectangle
Extended Aligned Pair Exclusion
Short Nice Loops
Short Alternating Inference Chains
Level: Extreme
XY-Chain
Aligned Triple Exclusion
Medium Alternating Inference Chains
Level: Mayhem
Extended Aligned Triple Exclusion
Long Alternating Inference Chains
Bifurcation
Sudokus not solvable by those techniques are rated to the extra Outlaw Level.
Download 'zipped' setup file here (6,1 Mb)