Just when you thought Angry Birds had left the nest, Rovio brings it back. Angry Birds Space is the first true sequel to Birds and comes packed with classic bird-slinging action, but entirely new types of puzzles. The space setting allows the game to toy with gravity and planets. Now, birds fly in whatever direction the gravity goes, adding a whole new dynamic. Since each planet has its own gravity field (like a halo around the planet), you can make birds spin around planets and fly in all sorts of directions.