WHO:Philadelphia native Robert Sun, creator of the "24 game," and 50 students from Penn Alexander, Bryant and Lee elementary schools.

WHAT:Students from three elementary schools will take part in a "24 tournament," and the game creator will hand out prizes to winners.

WHEN:April 15, 2004, 3:30-5 p.m.  (Prizes handed out at the end)

WHERE:Towne Building

220 S. 33rd St. (33rd Street and Locust Walk)

Adults without children may have never heard of it, but the "24 game" has

become something of a sensation among the elementary-school set.

Created in 1988 by West Philadelphia native and Penn graduate Robert Sun, the

"24 game" has evolved into nine editions and an online version and led to the

formation of the 24 Challenge Math Program, a tournament-style competition

based on the game.  More than 5 million students have participated in the

tournament in the past 12 years.

The game is now used in more than 500,00 classrooms worldwide, and the online version has attracted more than 80,000 players in Pennsylvania alone.