When you open a Room for the first time you can see an offer on the right side of your screen according to which you should give a certain number of items/diamonds every time you want to explore a room. When the offer is over, you won't have to pay items/diamonds anymore. Please, note that the offer will last for a week and there is no way to ignore it. If you fulfill the requirements of the offer in time, you will get a reward. This rule refers to Hunting Room, Hallway and Japaneese garden. According to the gameplay you should pay each time you want to explore Fortune-Telling room, Room 51, Sakura room, Oceanic room, and Laboratory.
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