This game from Math Games with Bad Drawings can be played with 1 to 30 people. Everyone has an empty 5 by 5 grid. A random number from 1 to 10 is chosen, and everyone must place it into their grid. After the grid is filled a score is computed. On each row, circle any groups with 2 or more of the same number, and add these circled numbers. Do the same for each column. The score is the sum of these numbers.