The player characters would need to explore these portals and discover their secrets, which may involve restricted planes inhabited by powerful hyper-real monsters, and origins with the death of the god Aoskar by the Lady of Pain.

Doors to the Unknown borrows this format and suffers from the nagging suspicion - the creators had loads of good ideas but no great ones.

An extra gulp factor is added with the fact that these portals kill non-key holders, and that after exactly two months they close for another 500 years - so if you're not back by then it's game over.

Even the dull cave crawl that forms the fourth plane is spiced up considerably with a healthy dose of backstabbing intrigue.

"[1] Webb concluded his review by saying, "The vagaries of Planescape are one of its true blessings, because it enables games to be played in a fast 'n loose style, which is why it's imperative that recognisable core themes are maintained, and why Doors to the Unknown fails.