Reflect the laser, smash walls, break chains, blow up bombs and spread toxic liquids. Learn new ways to get through each level and defeat all the creeps. Use the cannon to move objects, destroy radio waste barrels and bombs, and break up the chains. You can earn more stars the faster you complete the level goal. Once you have completed the level, you can go back and replay it. You can check the list of achievements you can earn and try your best to get them all. It's simple. The faster you kill the monsters, the more points you earn. Each shot counts so you will get more stars for each blast. To improve your score, you can always go back to the previous level and play it again. You can earn more points by completing combinations, achieving achievements, and setting new records.