>>It could very well be so that whoever made that particular level just happened to drag his mouse a bit too far out of screen when he was creating the collision layer, giving Abe a rare and small off-screen platform to stand on.
The interesting thing is, this "platform" can't be hit while dropping through the floor in the first place. (I know that all collision for Abe's vertical length is passed through, so I dropped down from a little higher area to prevent accidentally going through the platform.)
Also, the fact that Abe actually re-surfaced back to the screen must mean that you can do *something* down there.
>>I suppose nothing happens to the Mudokon counter when they do?
Hmm, didn't check.
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I found a small timesave from Oddysee. While testing auto-turn cancelling possibilities with sligs, I noticed that sometimes doing the necessary action on elevators, I skipped both the auto-turn and grabbing onto the elevator ropes, saving maybe a second. So, if you are ever controlling a slig, need to use an elevator, but are coming from the wrong direction...
(however, auto-turn can't be cancelled with sligs by running. Shame.)
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Fusionbly noted that it's possible to possess sligs while out of screen (via Elum teleport).
http://www.youtube.com/watch?v=YdzjK7IrFj8
However, doing this will not let you fool the flying electric orbs of doom, as they prove capable of shocking you even if you are physically several screen-lengths away.
Doing this the other way around, so that Abe is out of screen inside a room where there's an orb and a slig, chanting works because the orb disappears. However, sligs disappear too...
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Here's more info about the elusive "double pick-up" glitch:
http://www.youtube.com/watch?v=mlHTxP4HUOo
Note that on PSX version the game crashes if you attempt to pick up more than 9 of rocks (or anything?).