Recettear

- The best sweet spot for making customers richer, is at 104%, though some are terrible.

- Listen to the scrolling text. It gives you clues on when to place a lot of items on sale and get swarmed by customers.

- Sell red, buy blue.

- The numbers on items makes it easier to level up customers, so you have a use for slimes. Those numbers also influence how strong crafted items will become, up to 15.

- Never sell crystals. It is also smart to hold onto items if the store isn't selling it.

- Medicines give permanent buffs up to a certain amount.