500 people playing a single game of Pong

My Advanced App Development students at Niles North High School programmed a Pong game that allowed for 500 people to play at the same time (250 vs 250). Each player held a two-sided card controlling 0.4% of the paddle speed. If a player's card had Red facing the camera, their team's paddle went UP 0.4% faster, and similarly Blue for DOWN. (0.4% * 250 = 100%)

We are applying for a Guinness World Record for the 'Most number of people playing a single game of Pong'.