1. Commands:

New grid.

Clean the grid to manually insert a new one

Open a saved grid.

Save the current grid as a .txt file.

Turn on/off automatic pencil marks.

When you turn on the automatic pencil marks, all manually entered pencil marks will be erased and re-calculated.

Load a grid from the database. you can choose the difficulty level.

Open the database form: grids are divided by techniques required for solving. For each technique grids are ordered by decreasing difficulty

Undo the last action

Restart from scratch the current grid

Solution log.

If you double click a log's line, the program will bring the grid to that point.

Count the solutions

Solve the grid and generate the solution log.

Open this file

Generate a new grid

Grids are generated with random difficulty. The difficulty detail is shown.

Hint.

Suggest the next easiest move.

If you press a technique button in the File Menu, the program will show you how to apply the technique, if possibility exists:

Blocking numbers.

Naked pair

Hidden pair

Naked - hidden triplet

XYWing - XYZWing

XWing

Swordfish

Colors

Loops - Chains

BUG - UR

2. Levels & Library

The form shows the difficulty levels.

For selected grid the difficulty details are indicated:

18x2 (n)- 15x1(n) - 14x1(n) - 10x1 - 7x1 - 5x4 - 3x3 - 2x2 - 1x8 - singles 10

meaning:

Forcing chains have been used 2 times, (n) is the length of the longest chain,

X- Colors : 1 time - Simple colors : 1 time, 1 XY Wing, 1 Hidden Triplet, 4 Intersections, 3 Naked Pairs, 2 Naked Singles, 8 Hidden Singles.

The singles number indicates how many singles may be entered before using a difficulty level greater than 2.

3. Hints

Open the automatic pencil marks and suggest the easiest move.

You can accept the hint by clicking or reject with

If you click on a row number, the filled clues of that number will be highlighted,

if you click on a column number, automatic pencils will be shown with that candidate highlighted.

To remove the colors just click undo button.