In this game you must protect your defensive line from robots with your color archers.
To shoot an arrow against the robot you must select the same color as robot symbol and then draw the symbol anywhere on screen.
If it doesn't works then just try drawing it slower. At later levels you will have to mix the colors, to do so you click on one color and drag to another color.
Also later you will be able to create your own symbols for different spells.
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