Help in Crystal Mines (can't seem to progress)

[Sir Tawmis]

So I am clearly missing something; but I am at a loss as to what.

Crystal Mines map:

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And Crystal Mines Core map:

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I also dropped to the level below that; but there wasn't much I could do but pull a level to access the teleporter to be teleported back up.

[Isaac]

That map warrants a lot more of an in depth exploration.

[Dr.Disaster]

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You might want to explore a bit more thorough at the northwestern pedestral in the Crystal Mine Core.

[Sir Tawmis]

That map warrants a lot more of an in depth exploration.

I imagine they both do, right? And that's why I was asking for a nudge!

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You might want to explore a bit more thorough at the northwestern pedestral in the Crystal Mine Core.

That door up there is locked. I am uncertain how to unlock it or where to locate the key!

[Phillip_Lynx]

Its a whlie since I was there but ...

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Have you look for throwable pressureplates over the gaps?
Maybe cast some fireball or lighningbolt over the gaps to light the other sides

[Isaac]

That map warrants a lot more of an in depth exploration.

I imagine they both do, right? And that's why I was asking for a nudge!

It was my best attempt at a spoiler free hint.
It meant that yes there was stuff to find; and not wasted effort looking, and...

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There are secret buttons all over, that enable magic bridges; as well several uses for the rope, if you scrutinize the map.

[Sir Tawmis]

Well, I found one button - but that just led to the secret chest.
Are the secret buttons on the stone wall? Because if they are, that's going to be a pain in the rump to spot on those crazy cavern mine walls (of stone)...

And as for the rope... This is why I wish the game came with a more functional manual... I have the rope - figured it'd come into use - but not sure how to use it? Is it equip in the hand and right click to use like a shovel?

[Phillip_Lynx]

And as for the rope... This is why I wish the game came with a more functional manual... I have the rope - figured it'd come into use - but not sure how to use it? Is it equip in the hand and right click to use like a shovel?

Only rightclick, even in inventory, will do the trick if you stand facing a ledge .
Also the shovel you can use out of the inventory.