You need to go up on the roof and slide down seven times to make this your house. A house isn't a home until you've slid down it exactly seven times, you know.
If you try to slide down your new house and you land on a tack (たく), that means the house has rejected you. It isn't your home now. You need to leave and find a new home.
Currently there are no similar looking kanji which exist in the WaniKani learning system