This game does not require a copy of Castle Ravenloft for play - though the two can be used together.
From the publisher's website:
A cooperative game of adventure for 1–5 players set in the world of Dungeons & Dragons.
A heavy shadow falls across the land, cast by a dark spire that belches smoke and oozes fiery lava. A cave mouth leads to a maze of tunnels and chambers, and deep within this monster-infested labyrinth lurks the most terrifying creature of all: a red dragon!
Designed for 1–5 players, this boardgame features multiple scenarios, challenging quests, and cooperative game play.
This game includes the following components:
42 plastic heroes and monsters
13 sheets of interlocking cardstock dungeon tiles
200 encounter cards and treasure cards
Players: 1 - 5
Playtime: 60 + Minutes
Ages: 12 +
Published by: Wizards of the Coast