for the latter stages, (Mission 5 and 6) use Sky Minefield and the double firing machinegun (360degree one), put points in damage on the machine gun and in mines/cooldown/damage on the mine tower. then fill the rest with blocking, making sure to upgrade their health. in the other spots later on i put a time stop tower (increasing duration with points) and a armageddon tower (increasing health as they always seem to kill it).. easy 50 points :D 4/5
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