Use the A&D and arrow keys to operate. Yellow balls deal 1 damage, red balls deal 2 dammage, and green balls poison you. If a diamond hits the bottom you will get a bit of health, but you will get more health if you catch it. If a purple crystal hits the bottom, you will get a bit larger, and if you catch it bullets will spray, giving you a 12 second break from blocking balls. If a yellow crystal hits the bottom, all the balls will get destroyed, and if you catch it you will activate a power up storm, making it rain purple crystals and diamonds.