With mouse:
Click on any cell to edit.
The cell and the word it belongs to will be highlighted.
To toggle between Across and Down click on the same cell again.

With keyboard:
Arrows: Move between cells
Enter: Toggle Across/Down
Space erase selected cell
Backspace erase previous cell

Cheating:
At any cell, if the Cheat button is pressed, the letter is automatically entered correct. Remember, there is a penalty for cheating!
Scoring:
1. For each letter correct, +1 mark
2. For each letter incorrect, -1 mark
3. For each letter cheated, -1 mark
4. Time is counted from the first letter entered till the last letter entered.