I have already mentioned playing poker solitaire with a whole class at once (see my post on Feb 16, 2009).
Criss Cross is a similar game, and is just as popular with students. I discovered this game here.
My modified rules are:
1. Each student needs a 10 sided die (if you have enough), a 5 x 5 grid and a pen.
2. Get students to roll their die and write their special number in the centre square.
3. Play proceeds around the class, with each student rolling their die, and then announcing the number (1 to 10) to the class.
4. Students write the numbers in their grid, with the aim of forming 10 sets of 5 numbers (5 rows and 5 columns) that score as follows:
2 alike = 10 pts, 3 alike = 30 pts, 4 alike = 60 pts, 5 alike = 100 pts, sequence = 50 pts.
5. After summing their scores, the player with the highest total wins.