Select the room you want to enter; a window will open.

In this window, you can find a lot of useful information:
— current skill level;
— exploration mode or phenomenon in the room;
— the amount of energy required to explore it;
— special items required to enter(in some rooms);
— reward for successful exploration: experience and coins;
— items that can be found in the room (items you need for active quests are marked with an exclamation mark).

You can change the room exploration mode. For more information, see "How do I change the room exploration mode?" section.

Please note that rooms unlock in a specific order. If you do not have a quest to unlock a new room, complete the available quests until you get one that will allow you to enter a new room.

Press the "i" button on the panel displaying items that can be found in the room to see the chances of finding them.

Make sure you have everything you need to enter the room, then tap Explore.