Spooky Forest

Traditionally, folkloric trolls are unhelpful/antagonistic supernatural entities with a habit of becoming recognizable local landmarks after they get turned to stone. They're basically a Norse-only folktale concept so they cover a lot less ground than dragons, which are pretty much global. In the greater fantasy zeitgeist they've lost some of their already-limited specificity, sometimes allowed to retain their magical powers but frequently just being framed as large dangerous monsters with an optional healing factor.

I fear the Great Moon will kill us all one day.

In Super Mario World, many glitches exist that allow Yoshi to eat unintended objects, some of which end up placing unintended items into the item reserve box. One very commonly used application of this is placing a Magic Ball into the reserve box, which normally appears only in the Sunken Ghost Ship and instantly wins the level if touched.

If the Magic Ball is released from the reserve box inside a bonus game and collected, the bonus game will be "completed" in the same way a level would be, instead of being "won" the regular way. This is, of course, not intended and will cause the bonus game room to reload, except without the blocks that comprise the actual bonus game in it. Mario will be trapped in the empty room forever until the game is reset.

Note that -the pipe in the upper left is an exit-only pipe and cannot be entered -there is no timer so Mario cannot die from the time running out -pressing Start + Select does not work so none of the potential ways of leaving the room are actually possible.

Source: Wingcapman