Arrow Keys: Move Z: Jump, (Lets you avoid the orbs.) X: Duck (Lets you avoid the orbs and Fire Breath.) A: Attack, (After Wario attacks, he can be hit to lower his health.) S: Dash (An extremely fast move to the right or left.
Tips: You gain back 1 Power (aka Health) every 10 seconds. Don't forget to jump and duck when Wario starts to fire out a bunch of orbs, they can get pretty wild when he's low on health. Wario does a laugh before breathing fire, you should use this to duck, as the fire breath/fire ball aims towards Mario, and is hard to dodge even with Dash, and Duck avoids fire breath entirely. Each orb does 2 damage. Fire Breath does 3 damage. Wario's Chomp/Bite does 5 damage. Based on "The Wario Apparition."