New Version: 1.81

Version 1.81
Mark invalid move function improved.
Minor bug fixes.

Version 1.80
Minor bug fixes.

Version 1.79
Added Empty Rectangles technique.
Added Empty Rectangles documentation.
Minor bug fixes.

Version 1.78
Fixed strange behaviour puzzle generator: generator fails to find requested puzzle.

This Sudoku program generates puzzles at every level which can be printed or can be solved on the computer. New puzzles are generated in a few seconds. This program also offers the unique features of teaching a player how to solve more challenging puzzles. The Sudoku software can provide hints on which technique to use, so you will become a better player.

The program has ten predifined levels that are based on puzzles you find in newspapers and puzzle books. It is even possible to generate puzzles on a custom level.

Into Sudoku uses most well-known techniques to generate interresting puzzles.

Features:

Generate puzzles on every desired level.
Learn how to solve challanging puzzles using advanced techniques by asking hints. The computer can be asked for a hint without solving the puzzle for you.
Get human-style hints with highlighted cells and explanation in text.
Read about different techniques in the included documentation.
Let the computer take over the time consuming task of determing candidate values. The program can automatically calculate the candidate values without spoil the fun of solving the puzzle.
Print puzzles so they can be solved on paper.
Simple to use.
Highlight values to easily get an overview of the puzzle.
Draw colors and/or lines to help draw patterns.
Multilanguage; Dutch, German and English.
Print multiple puzzles on one page.
Symmetrical puzzles; random, rotational or reflective.
Number and letter Sudoku.
Filter candidates.
User friendly layout.
Practice mode; practice any technique.
Chalanging puzzles; play Sudoku's up to 10 stars.
Lightning fast Sudoku generator; generates up to 5000 puzzles per minute.
Build in community; online puzzle collection and forum
Supports most well known solving techniques:
SingleInBox
SingleInRow
SingleInCol
Naked Single
PointingPair
BoxLineReduction
NakedPair
NakedTriple
NakedQuad
HiddenPair
HiddenTriple
HiddenQuad
RemotePair
X-Wing
SwordFish
Color
MultiColor
XY-Wing
XYZ-Wing
Bug removal
Unique Rectangle 1
Unique Rectangle 2
Unique Rectangle 3
Unique Rectangle 4
Nice Loops
Double implication Chain
Triple implication Chain
Trial & Error