The world has been eroded by an unknown space called the "Corridor." The selected person will enter different dungeon worlds in their dreams. Each dungeon is an independent scene (school, hospital, amusement park, ancient palace...), But the same rules are hidden behind them - survival and puzzle solving.
Each dungeon has a different theme and difficulty. Points and props can be obtained if you clear the level, and your existence will be wiped out if you fail. Players can cooperate or betray each other.
Intent: In a closed world built by rules and lies, how do humans maintain themselves under the pressure of survival and find a way out through mutual trust and support.