Gamers' Info has reviewed Mask of the Betrayer. Not assigning it a grade or score, the reviewer nevertheless had some excellent observations:
The only issue I really had with the game, beyond the somewhat distracting spirit meter, is that the camera would not behave consistently. I found myself fussing camera alignment more than I should have or cared to. But even this minor detraction couldn't mara game that keeps you involved in a developing plotline. The expansion is more than worth it. The additional pieces of the toolset based on the newly designed areas in the game will be a great addition to any mod creator's arsenal, and the ability to make the new classes and races in the original campaign will keep those who love to replay the game interested. I highly recommend the expansion for those who own the original and want something more to try.
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