Spell Calculus

*Updated to fix level 2 not loading*

The wizard is throwing fireballs at you and you only got one tool to stop them,  a weird flashing colour machine.  Solve the math fast or get smashed!

Watch the flashes (4 colors!)
Solve the math quick
Punch the answer into the calculator
Block the fireball (or don't... and lose a life)
Both you and the wizard got 3 lives. First one to hit 0 loses!
Simple rules, crazy stress. Good luck