pretty funny
This is probably the best cave story flash on newgrounds I've seen yet. Not that there are a lot of them, but.... yeah.
And also: for all those that don't know how to get this secret stage, you need to:
1.Get the booster v2.0, not v0.8. To do that, you simply have to not talk to professor booster after you see him fall past you in the labyrinth.
2.You need curly to live after the battle with the core. To do that, you need to get the tow rope. The tow rope is located at the bottom right corner of the room in which you fight the core. Second, you need to take curly with you. Third, you need to jump into the house that you pass by while carrying curly. And lastly, you need to take her with you after you reboot her.
3. When you are outside the island, you will run into an opening in the side of the island not far up from where you start climbing. Go inside and you will get a timer. It is important if you want to do speed runs during the last level.
4.Finally, you need to give curly the Ma Pignon after you meet her again in the plantation. The Ma Pignon is located in a door only accessable by a booster near the top right corner of Arthur's grave. The Ma Pignon will give you a medallion. Exit the room and examine it through the inventory. It will say it is useless. Go back and talk with the Ma Pignon and it will fight you in a surprisingly hard boss battle. After you kill it, take it back to curly and jam it into her mouth.
5. After you get curly's memory back, and she talks to you about your past. Talk to her again, and she will give you the iron bond.
And after the "final bosses" go back into the house as you are fleeing. There should be an opening in the floor. Have fun!!!