Playing on TurboWarp highly recommended (otherwise some turrets may stop shooting) If you really don't want to, press S before the first wave to enter Scratch mode (1000hp instead of 200, easier boss wave) Click to place towers on unoccupied spaces. Press left and right arrow keys to switch between tower types. You can also click on the different types in the shop. You can start waves with Space. There are 40 waves, and Wave 40 is a boss wave. If you pass it, you win.
