Grimrock

hello,

i've gotten most of the secrets and 1 gem from the abyss in the crystal mines. however, i'm stuck on the 2nd floor, around the pit leading down to the abyss. i can't find a way to open the doors to the north and south (with spiders behind them) - is there a secret button i'm missing, or do i need to drop down from the entrance level? i can see the gem on the entrance level but don't know how to get there.

also, is there any wway to get to the ladders on either side of the fearless puzzle corridor?

thanks!

on the 2nd floor i'm also unable to opent he door with a mine key lock (i already used the mine key from the simulacrum puzzle + another one), is there a third mine key?

I was also stuck there.

ah, thanks!!!!!! found it!

Ah, thanks Ixnatifual, I was stuck there too... Actually, if you look from the other side near the door, you can see the plate and figure it out, no need to peek through the darkness.

If that's the case I take my criticism of the puzzle back.