From the instructions:

"Bocaro....it's fun, fast and easy to play! Trying to get 12 strikes in a row for a perfect 300 game makes Bocaro exciting.....every time you play."

Bocaro is played and scored just like the sport of bowling.

Each player may turn over (roll) two cards in each frame, trying for a count of 10. If the first card is a strike you don't need to roll another card. If the second card is needed and gives you a combined count of more than 10, you only count 10 for a spare.