Heroquest was a 1989 collaboration between Games Workshop and Milton Bradley, published by Milton Bradley. The pieces are unmistakably Citadel, many of them being versions of then current pieces.
There were a couple of variations of the game, the US and UK versions differing slightly. An expanded Advanced Quest version was released in 1990. Four expansion sets, Kellars Keep (1991), Return of the Witch Lord (1991), Against the Ogre Horde (1993) and Wizards of Morcar (1993) were released for the game. There were also an Adventure Design Kit (1990), a Barbarian Quest Pack (1992) and the Elf Quest Pack (1992). The models were a popular source of inexpensive troops for Warhammer players.