3d tiling system?

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Hi, I was wandering if anyone knew how to make a 3d tiling system like the one used in the first 4 tomb raider games? Is it similar to 2d tiling? if so how would i make tiled levels etc?
thanks

edit: I would take the large guess that i would use the dim command except with three memory location decalared in it like dim(x,y,z). which aint really the hard part of this, it's more of the 3d surfaces etc that is confusing.