To use bombs inside houses and buildings, or any place that you normally cannot use them, set the Tingle Tuner to Y. The quickly press Y then start/pause right after (you have to do it so fast that he doesn't take out the tingle tuner yet). Then while on the inventory screen, set bombs to Y. Then unpause the game and Link should hold a bomb over his head and a message will appear that says you can only call Tingle in places that have maps. Quickly press A or the bomb will blow up on you. Now you can move around with a bomb.