Across Lite is a great help for solving crosswords, can be used to test ones knowledge by solving puzzles.
Crosswords for solving in Across Lite are in individual files (one for each puzzle) with the filename extention of .puz (e.g., sample.puz). This way, you can easily share them with friends or download new ones from the Internet.

Move around on the puzzle grid:
1. Click anywhere on the grid with the mouse to move current cell to inter into.
2. The arrow keys will let you move one cell at a time in the corresponding direction.
3. Use the Shift key in combination with the arrow keys to move one clue answer at a time.
4. Use the tab and backtab keys to move one clue answer at a time.
5. Use Enter/return key to skip to the next clue answer
6. Click on any clue in the clue list to move to the asnwer area for that clue

The license of this software is Freeware, you can free download and free use this puzzle game software.