A platform that sometimes disappears.
Useful level-design + story-telling/narrative feeling combination.
Maybe it rejects you based on your held items.
Maybe you can scoop it up and put it in your pocket. item platform?
A Dino game.
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A runner game with a day/night cycle.
Collect items/platforms from rooms, move them around to solve the puzzle.
By day, learn the ropes and prepare for night fall.
By night, be-ware the dreams and ghosts that haunt the rooms.
Break the loop-spell to proceed in the game.