Description of the Sims' trading process: In the Middle Ages, the items in the gray box indicate that they can be purchased in the store, or collected, or made by themselves (when controlling the corresponding professional villains), or purchased from the corresponding professional villains (when not controlling them), that is to say, they don't have to be traded to get them, so it is best to avoid replacing these things. The items in the blue box indicate that they can only be obtained through trading (or a small amount through adventure). The arrow between items indicates the transaction process, the color of the arrow indicates which country to exchange (see the legend for the color of each country), the number X indicates how many items are needed to exchange 1 target items, and the unmarked number indicates 1: 1 exchange. Imported goods from every country mean that you can exchange these goods for money in this country (just put them on board for trade). If these goods have other uses, be careful not to put them on board. MysticalMetalFragment (hereinafter referred to as MMF) and unicorn horn are two main rare building materials, and they are also the two main routes in the picture. The process is the longest. Note that both routes have many branches, so if the target is these two kinds of materials, don't take those branches when trading. The items obtained from the branches are very common and can be purchased or made by yourself. MMF is obtained by phophophophorus in four steps, and 1 MMF needs 2x4x3x5= 120 Phophorus. Because the demand for MMF in construction is still relatively large, and several top-level equipment are needed, each piece is often better than several MMFs, so a large number of Phophorus are needed to meet the requirements. Therefore, you should always collect them (there are many places behind the blacksmith shop on the way to the forest, and there are also singles in other places, such as the right side of the intersection leading to the store), and you can buy some Phophorus once a day when you go to the store. Unicorn horns can be obtained by wild flowers or nightshade in five steps (if it is obtained by WatchedWater, only four steps are needed, but the required number has increased from 3x2x2 =18 to 5x5=25, so it is not recommended). 1 It's up to you whether the unicorn needs 6x3x3x2x3=324 wild flowers or 3x3x3 =162 dark nights. Although the dark night needs less, wild flowers are more common and can be used by all professions. Unicorn only needs one kind of equipment, Doomplate, and each piece only needs 1, which is not as big as MMF.