Entrance 1 and 2, easily recognizable by the upside down torches. The low wall and pillar is also distinctive at entrance 2. Entrance 3, wide open entrance with a low wall directly in Melinoe's face as she enters. The advice for this room is same no matter which entrance, head directly for the nearest reward. Once cleared you can then head directly up to hit the golden bough, but this should not be necessary, as there are only two other possible reward locations, and you will need to pass one to check the other. From the first reward location head directly towards the highest reward location and if you still need to collect a reward head towards the last location on the far side of the room. Entrance 3 can be quite slow if the left reward location is populated.