It's a fantasy role-playing game.

DM: You are Vax Vax'ildan, a half-elf rogue . You are the member of the famous group of adventurers. Previously, Around the back of the building, Percy goes to the first door he sees and attempts to open it, only to find it locked. you runs up and pulls out his lockpicks, unlocking the door with no difficulty.
DM: Rain's still pouring down, you have your hood up, the water's dripping past your face as you're trying to concentrate. You get the tools in. It's not a very complicated lock. (click, creak) You push it open, leading you guys into the interior of what looks like a kitchen.
Player: Perception check. Which is a 25.
DM: 25. As you look inside, it's a cold kitchen. It hasn't been in use for a while. The fire's up, there's a little bit of a slab in the corner where most of the preparations are done, there's a few cabinets that are up. It's dark. There's no lantern.
Player: And what are the other doors?
DM: There's a door immediately to your left, and there's, across the way, is an archway opening. There's no actual door there. It's just a walkway that leads into the next room.
Player: So it's open straight ahead?
DM: Yes.
Player: I haven't used any movement. If I go to the archway right across, right?
DM: Yep.
Player: I'm clicking my boots as I walk forward. Do I perception check again at the arch, or does the same one hold?
DM: As you glance through, you can see what appears to be...
Player: I unlocked the door and I've walked ten feet.
DM: There appears to be a hallway. There's a hallway that goes across the way. There's a door at the end of the hallway, and two doors to the right and left of this hallway.
