This is a cool idea. Here are a few puzzle examples:
Beethro starts in the south of a certain room. The rest of the room is covered in dollops and blobs of tar(which has walls in it, by the way. I think Beethro should be able to swim over walls). Due to the tar mother being in the north, if Beethro had to cut his way through the monsters(or if he tried to wait for the tar to surround them) he would, quite simply, be stuck forever(assume the tar grows to be impassible). So Beethro has to find a way through the room WITHOUT BEING EATEN BY MONTSERS, and ducking into tar to avoid critters rather than killing them. This would be a tricky puzzle, as he would have to be able to plan a route to the mother within 30/60/whatever turns, and be able to use tar to your advantage as opposed to smiting it at every opportunity. Say when you get to the mother the potion wears off, beethro draws his sword and smites the mother, and now he has a horde of monsters(and a bunch of walls) between him and the way home. So now he has to clear out the room.
Another example: Tar over some yellow doors. Beethro is solving a door puzzle(more like a chamber puzzle, with each little chamber having a few orbs and doors) when suddenly, he finds... TAR???? So now he has to be able to open the right doors to have the tar grow enough so he can use the potion, get inside the tar, and get past, say, a wall under the tar at the end of the maze. After he kills the tar mother, he can step on a trapdoor and drop the walls of the maze to clean up the tar babies.
BTW, the first puzzle assumes that you can both go over walls and can't use your sword when you've drunk the potion(A reasonable assumption), you can go over walls(logical, I think. Tar is REALLY thick, so I think that the potion just makes Beethro, I dunno, more "
tar-enterable"
, so he can enter and leave the tar without being squashed flat, or needing to breathe. The tar is really thick, so going over walls should be no problem. Beethro just swims up at an angle
)
The second one assumes that you can go over walls when swimming in tar, but I can come up with puzzles for just about any combination of factors in this potion.
~joker5
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