The Story Goes On

This won't be obtainable until you first complete one cycle of all six levels. After doing so, you'll have the ability to seek the Forest Page. Start from the Forest level (because if you start from any other level you'll skip the Forest level) and proceed through the rooms like normal. Keep an eye out in the rooms across the top of the map for a doorway leading up that isn't shown on your map (the map will show as if it's a solid wall above you, when there is actually a gap to go through). The spawning of this room is random, so if it isn't there, you may need to cycle back through the levels again until you get it to spawn. Inside this secret room is a big hole in the middle of the floor covered with spider webs. Push the nearby torch and use it to burn the webs and drop into the dungeon.

Inside the dungeon, you won't have a map. Proceed through the rooms in a relatively linear way, killing enemies and burning webs so you can progress once you get the Lantern. At the end, you'll fight a spider boss, who is very simple and basic to beat. Once dead, the dungeon will start blowing up and you need to escape. Thankfully you don't take damage from the explosions and there's no time limit, so find your way out. Once outside, the dungeon will blow up and you'll be rewarded with the Forest Page.