I'm sick of having to design around what is an obvious misdesign in the original graphics sets. Lemmings' "pin" (the pixel that determines where the lemming "really" is) is one pixel below the floor, okay. So traps' trigger areas should extend one pixel below the floor as well. Especially traps that have a visible part to show where the trigger area is. This should sit on the floor; it shouldn't have to be buried. This is 2018 and we do
not mislead the player! It is the golden rule of modern level design!
Here's a run-through of all traps in the original and ONML tilesets:
Dirt: Bear trap and rock trap have extended trigger areas. 10-ton weight has a trigger area that stops
above ground so it has to be buried 2 pixels
Fire: Firepit's trigger area stops above ground.
Pillar: Rope trap has a "blob" of terrain that's meant to be buried, but even the metal support has to be buried to get the trigger area to work.
Crystal: Trap 1 is meant to be buried, enough remains visible. Trap 2 is okay. Trap 3 has to be buried.
Marble: Squisher has to be buried.
Brick: Wheel has an extended trigger area. Squisher has no indicator.
Rock: Weed trap has an extended trigger area.
Snow: Icicle has no indicator. (But note the the trigger area extends below the rectangle of the trap. It's almost as if the designers realised this was a problem and fixed it in the ONML sets! All the more reason we should fix the Orig sets to match.)
Bubble: Suction pipe has no indicator; again trigger area extends below the trap rectangle.