New Super Mario Bros. Wii: 2- Castle Replay -- Feeling Like the Master

I used the Helishroom to get the 1st Star Coin. I get the 2nd Star Coin and a 100-coin 1-up. I get the Fire Flower to kill the Piranha Plants. I get the 3rd Star Coin and reach the boss. I get in the three hits easily and Roy only goes in the pipes once. This strategy of hitting the Koopalings immediately after they come of the shell cycle is working very well.