Lanefan
Victoria Rules
The italicized bits seem so fundamentally obvious I don't know why they need stating.White Plume Mountain. Castle Amber. Against the Slave Lords. In all these modules, and as far as I know in the modules that WotC is selling today, we work out whether or not the PC falls down the pit or triggers the pressure plate by (i) tracking the PC's movement on a map, based on (ii) the player's description of where their PC moves.