From the back of the box:

A fast-paced numbers game that adds up to fun!

Keep the count curbed at number 99 or your're out of the game. In turn, players add number cards to the count pile. The count can quickly raise or lower at the flip of a card. The player who cannot keep the line at or below 99 loses the round. What's your limit for fun?

Includes: 52 jumbo number cards, 32 markers, instructions.