You start with $10,000 and an empty store. Buy stock crates and furniture from the terminal, place shelves and checkouts wherever you want them, load the shelves by hand or leave it to your workers, and set a price on every product.

Pricing is the core decision. Every item is judged against its base price and rolled separately at the till sell; at or below base and it always moves, mark up a little and you find the profit, push too far and shoppers won't buy. Wholesale costs swing each night, so a category that was cheap yesterday may be the one to avoid today.

The store runs on a continuous day-night cycle. By day, customers arrive with their own tastes, fill their bags, queue at the checkout, and occasionally try to walk out without paying. By night, staff go home, wages come out of your balance whether they earned them or not, the day's numbers are totalled up, and the game saves before dawn.