Doomsday survival game? I became a boss by picking up trash

【Apocalyptic natural disaster + garbage collection + stockpiling + system】
In order to save his seriously ill grandmother, Song Yu chose to enter a mysterious survival game, which includes zombie apocalypse, high temperature, ice and snow, rainstorm, rainforest, ocean, desert, desert island,... various world levels. Each time he passes a level, he can get points and real money.
After completing the game again and again, Song Yu gradually discovered that the disasters in the game seemed to be beginning to happen in the real world.

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