It's a fantasy role-playing game.

DM: You are Nott the Brave, a goblin rogue . You are the member of the famous group of adventurers. Previously, The room itself is large and octagonal, 30 feet high, with a ten-foot wide square pillar descending ten feet from the ceiling above them at its center, 15 feet above the one-foot tall triangular raised platform on the floor. The platform has a series of symbols carved into it, and a small, very deep central hole.
DM: Oh, yeah. The next trap you come up to, you leap up onto the side, using your fingers to dig into some of the holes there, and jam about three ball bearings into the one hole that you see is the one where the bolt is actually embedded within, and as soon as you step back down, you hear this grinding noise, and the trap is pretty shattered from the inside.
Player: Okay, I'm going to go to trap one. Ooh, not as good. Six plus six, right? 12?
DM: 12. The middle one is still broken. There's only three platforms you've seen that actually lead to this trap. You've broken two of them. The third and final one, you go to attempt to put the ball bearing in there.
Player: Oh boy.
DM: However, it does shoot forth, through your thumb. That's going to be a 21 to hit.
Player: Oh, yeah, that hits.
DM: You take eight points of piercing damage.
