MPQ Sudoku
MPQ Sudoku v1.5 (Januari 10, 2015)
2010 MPQ-Software - All rights reserved
MPQ Sudoku is a Sudoku solver/helper program for the Windows platform.
Pointing Pair, BoxLine Reduction  - Medium
X-Wing, Swordfish, Multi-value X-Wing, Empty Rectangle - Crazy
It has the following build-in solving techniques covering eight difficulty levels:
Hidden Single,  Naked Single - Easy
XY-Wing, Two String Kite, Skyscraper, XYZ-Wing, Simple Coloring  - Insane
Naked Subsets, Hidden Subsets - Hard
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 - Kamikaze
Extended Aligned Triple Exclusion, Long Alternating Inference Chains, Bifurcation - Mayhem
XY-Chain, Aligned Triple Exclusion, Medium Alternating Inference Chains - Extreme
Sudokus not solvable by those techniques are rated to the extra "Outlaw" level.
Click this screenshot for larger image
MPQ Sudoku...
...comes with over 50.000 sudokus to solve
...has some extended build-in hint functions
...has the ability to customize the Hint colors
...can import sudokus by different manners

Minimum 1024x768 screen setting required
Download "MPQ Sudoku" (6.1 Mb)