Doomsday City: Leveling Up by Slaying Monsters

He transmigrates to a parallel world and activates the Strongest Cheat System.

"Congratulations, you've even killed a magic boar! You receive 100 energy points, enough to unlock the fairy-tale world."

"Congratulations, Host, on killing a red-eyed zombie! You receive 100,000 energy points, enough to unlock the wuxia world."

"Congratulations on killing the gods and demons of the myriad heavens! You receive 1,000,000 energy points, enough to unlock the fantasy world."

Zombies, undead, devils, demon kings, even gods: they're nothing but experience points for me to level up.

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.