Instructions
Enter a free play round of bowling by clicking "Play Now" on the main title screen.
Roll a couple of bowls to try to set up the 7-10 split. This means aiming for the center pin, which will split the pins to split and possibly leave the 7 and 10 pins standing.
Choose the "Ball Doubler" power-up. This will make one ball turn into two in the middle of your throw. With two balls, the odds of picking up the 7-10 split are greatly increased.
Roll your ball right down the middle and let the ball split in two. Each ball should tail off toward the split pins. You should now receive the last trophy.