#86 Wall walker

[Luke Brennan]

A new Special Flag for things.ddf called WALLWALKER,
which, when used would cause the monster to move on the
floor or wall or ceiling, twisting the sprite respectively.

Imagine a spider or an alien to get what I mean: it can
walk along the ground(sprite is vertical), or climb up
on to a wall (sprite is horizontal) or even onto the
ceiling(vertical-upside down)

[Andrew Apted]

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Heh, it would be a neat effect, but it's pretty difficult
(time consuming) to code up the special physics for
these critters.