Big Tree Defense - Grow your tree to protect the world from interdimensional insects! You goal is to kill all the insects in each level. Build your tree out and up and place weapons on the trunk and branches to fend off the invading insects. Your weapons will not fire on insects once they've landed on your tree's trunk, so spread out and place weapons with that in mind. Play the game with the mouse. Scroll with the mouse wheel or use Z and X to zoom in and out. Drag with the mouse or use the arrow keys to move the playing screen. Hit the Spacebar to center the scene on the trunk. Pause with P. Change speeds (normal/fast) with Shift.