Isn't there a bunch of stuff about "snakes and ladders" in Lair Of The White Worm? Maybe a dream sequence?
Yes, there is a bunch of stuff about "Snakes and Ladders" in "Lair of the White Worm," and the villainess in the film uses the board game to seduce an innocent boy scout, she has picked up, while he was a thumbing a ride in the rain.
There are also a couple of dream sequences in the film. In one, the heroine climbs a flight of stairs, touches a crucifix that has been sprayed with snake venom and has a dream about Christ being devoured on the cross by a snake. And in the other, one of the heros has a dream about being in a SST, that is filled with snake symbolism, and at the end of the dream, he climbs down a flight of stairs into the light.
But, the film that SoulofFire is refering to, is most likely "Dreamscape." I saw it, when it was first released, and I wish I remember more about it, but it was only that one time, and it has been along time ago.