The "
lava boots"
(in game--fire suit) come:
Click here to view the secret text
×after you beat the third temple, Winter Factory/King Armin's Fort.
The room you've posted is not solvable, as far as anybody has found, nor returnable, but that is how it is intended.
Your way forward is likely:
Click here to view the secret text
×In the first room with musical notes OR in the room with seep monster sensors.
If that's not the case, please post the last item you got (or go to where the ! was on your last staircase.)
____________________________
Click here to view the secret text
×
First Delver! (I was the first non-tester/dev
to conquer TCB.)
d
/dy