Microsoft's Mac games publisher Bold will show an early preview version of Dungeon Siege at Macworld Expo from tomorrow.

Dungeon Siege was one of the top-selling PC games of 2002. It was originally published by Microsoft and is being ported to the Mac by Westlake Interactive.

The fantasy role-playing game is set in a 3D world offering adventures in dungeons, mountains and underground. Players can navigate without ever watching a loading screen, the company claims. Players can play alone, or in parties of up to eight.

The game also supports multiplayer gaming and should be available in early 2003.