Doomsday Department Store: My Supplies Are Unlimited

Daily refresh: At midnight, an “infinite supermarket” that overlaps with reality opens exclusively to the protagonist. Its supplies are random: it might contain ten thousand tons of rice, or an unlimited supply of toothpicks.

Mandatory reset: The “inventory” must be emptied by any means before midnight that day. Even leaving behind a single bottle of water will cause the System to shut down forever.

Value anchor: The System selects a “key product of the day,” such as unlimited antibiotics. How this item is distributed will subtly affect the following day's “difficulty” and the rarity of the refreshed goods.