RTABC Guide/Big Boo's Balcony
This is a guide for how to beat the star Big Boo's Balcony with 2 A presses in an RTABC run.
Method
Using the strat from the first star, defeat four Boos and the Big Boo to activate the staircase. Ascend the staircase using VSC, and enter the far right room. With some luck, manipulate the flying books into positions that will allow you to side flip, bounce off both of them, and allow you to reach the third floor. Make sure to keep A held. Once that is completed, head to the outside of the house to fight another Big Boo. Defeat him, and use jump kicks (A still being held) to climb the slippery roof. When you are near the star, you will have to jump into it to collect it.