I just found out that in the second room there is a secret room, if you try hard, you can get there! but I don't want to tell you what's there, so go ahead.
I turned over the table from the second room and broughtone of three boxes from the third room, yes, it is difficult to do, but it is possible.
maybe there are other ways to get into this room, but I didn’t find them.
I didn't see any keys in tutorial