How Can a Level 0 Demon Lord Ruin the Player’s Experience?

Reincarnated as a loli demon lord in an online game — no level, no underlings, no army — she has no choice but to rely on her past life’s gaming experience and embark on a path of tormenting all players.
Creating hell-difficulty dungeons, designing deadly leveling zones, posting deceptive guides on forums…
“Suffering and getting wrecked are part of the game. If you don’t like it, don’t play.”
“Players — as the name suggests — are meant to be played with, aren’t they?”
— by a certain pink-haired girl