You are a bit late to enter the house where a party is about to begin. The house is locked and you will have to do something very special to be able to enter it. There will be things to be found from the surrounding and used intelligently because I can see some notes that have some instructions written on them. It appears to me that the host of the party wants to tease you a bit and you should not mind because he is your good friend and he has the right to play with you. You should focus on trying to outsmart him by finding a way to unlock the door and enter the house.