Grab a cue

In front of the stairway to the next level stands a shark. Next to the shark stands a pool table. "Before I'm gonna let you through this room," says the shark, "you're gonna have to sink the 8 Ball. But you gotta do it off of n rails, or it doesn't count."

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Grab a cue
(Failed attempt)

You manage to pocket the 8 Ball, but only off of n-1 rails.
"Sorry," says the shark. "Better luck next time."

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Grab a cue
(Successful attempt)

Using considerable English and considerabler finesse, you carom the cue off of n rails and sink the 8 Ball.
"Impressive. Be my guest," says the shark, as he points a fin at the stairs.

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Occurs at Fernswarthy's Basement.

Notes

• n is equal to lvl^1.4 + 2.