Boggle

First, decide whether you want to play Big Boggle (with 25 letters) or the standard version (with 16 letters). Then, press the "Fill Squares" button and start the timer. Students/teams have 3 minutes to write down as many words as they can using the letters in the squares.
Rules that I use are:
Words must be at least 3 letters long.
No jumping (letters must be connected horizontally, vertically or diagonally).
Letters cannot be used more than once per word.
The player/team with the most words gets a point.
Other official rules (which I don't use) are:
Duplicate words are eliminated and only unique words are scored with the following points, based on length:
3-4 letters: 1 point
5 letters: 2 points
6 letters: 3 points
7 letters: 5 points
8+ letters: 11 points