You were cleaning up around your room till you found a key made of some weird rubbery material. As soon as you touched it your door turned colorful, with rainbow lights coming from under it. You opened it.

There stood before you your old imagination realm. You had created it out of sheer will for something happy when your parents had divorced. You were realizing that this was your coping mechanism for stressful dull times. Curious for nostalgia, you stepped through.

The world was still preserved exactly as when you last left it, the grass was saturated green and rubbery to avoid falling damage from cliffs, the rivers were rainbow and tasted like candy, trees, and plants grew in pink shades and produced gummy fruits, and natural disasters never existed. But the world rules still apply. You had unconsciously integrated rules from reality because of your mom and the world twisted these rules into horrible fates.

If you stay in the sun for too long your body will start to melt into a puddle.
If you don't use table manners when eating you will start turning into a plant.
If you litter, living trashbags will come to swallow you up.
If you do not sleep at night, a giant cloud will rain sleep-sand on you and put you in a coma for days.
Eating too much candy will turn you into a gummy.
Wearing inappropriate clothing will turn you into a gold statue.
If you stay around a specific creature for too long you will slowly transform into that creature permanently.
If you are left alone for too long you will become an invisible ghost.
If you use foul language your mouth will disappear off your face.
If you treat creatures or the realm badly or be a bully, you will turn into a goblin.

As the memories were flooding back, the door closed behind you and disappeared, which was bad because you left the key in the real world. Every person has their own different imagination realm, and worlds can't cross. You were quite literally stuck here for eternity, all because you forgot the rules of the realm itself:

~~11. NEVER LOSE YOUR KEY.~~

~~12. All creatures of the realm like to trick you in some way that will either leave you swallowed up whole, a slave, a changed body, losing items, or worse.~~

~~13. Only you are allowed to enter your realm, any other humans that enter this realm are pushed out of the door or are unable to pass through.~~

~~14. Any consequences directed to you are of your own fault and are unable to avoid and will always catch up to you.~~*

The sun was halfway in the sky, days only last minutes here to keep humans from staying here for too long, but you were trapped. The realm is too stable for humans to stay too long, it changes and warps them to fit in with the realm to avoid messing up the ecosystem and balance. What now…?