Description：Take part in a new war on the planet PX-21. Build a towers, defend the base and win! Learn the history of PX-21 in 8 new bloodiest chapters.\ \ \ \ - Classic tower defence in sci-fi setting. \ \ - 8 addictive missions. \ \ - Lots of different towers.\ \ - Tons of enemies and FUN!

Instructions：- Use mouse to select and place towers.\ \ - Press \“Esc\” to cancel selection.\ \ - Read the tutorial for more reductions.