Just count to 100, but the only even number you can say is 100. Try and do that. Also it resets after being left alone for 1 hour. Example:
User 1: 1
User 2: 3
User 3: 5
(A bit later...)
User 10: 100!
(Game resets.)
Other example:
User 1: 1
User 2: 3
(1 Hour later...)
User 1: 1
LETS A GO!