One of Animal Crossing: New Horizons’ biggest features compared to past games is Island Designer, an app for the in-game NookPhone that lets you terraform your island to your liking. This includes pathmaking, building water features, and building cliffs–or destroying those things, if you want. The island you get is not the island you have to have, and it can be changed to your heart’s content.

Below, we’ve outlined how to unlock Island Designer as well as each part of the app, how to work each of its features, our best terraforming tips, and everything else you need to know. We have tons of other Animal Crossing guides, so be sure to check out our Animal Crossing: New Horizons guide roundup for all the latest.