If you've been exploring around the house's exterior in Blue Prince you'll have likely come across an Apple Orchard. Near Simon's tent. A padlock on the gate will stop you from making your way into this space but with this guide we'll leave you some hints to allow you to get in.
Apple Orchard Hints
Hint #1 - You'll need to obtain a four-digit code from somewhere inside the house. The room with the code won't have a connection to the Orchard, but what the code is on inside a room will have to do with the Orchard.
Hint #2 - The Dark Room is where you'll find this combination, make sure you can see
Hint #3 - Seeing isn't all you'll need; you'll have to take a closer look

Gate Combination Solution
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Blue Prince