Click Red to attack, holding the mouse pointer down. then, drag to the pig. If you don't drag it to the pig, you just have to click and hold again. then Red will attack the pig, then the pig attacks Red. This goes on until you either run out of health or the pig does. If the pig loses all HP before you, then you win, If you run out before the pig does. then you lose. It's basically like the original Angry Birds Epic. Except it's not touchscreen. (unless you are playing this on a touchscreen laptop or your phone.)
Credit to Rovio, @ToadsTunes, and @chavis79 Fixed glitch when the circle is not on the pig and released, It'll stay
