Level 81

The solution to this one is obvious as long as you bear in mind the obvious consequence of dragging a block of ice over a fire.

Level 82

The lone diamond has to be burned but so can any other block that's high enough for the fire block to slip by it.

Level 83

A sneaky one.  Two pipes filled with blocks with a fire block in between. What to do ?  Can all the blocks be burned ?  Nope, there's a spade on the ground.  Can you get blocks by the fire without burning them?  Nope, not enough room to leave charcoal on top of the fire.  So what's the only option left?  Why to make kills without dragging blocks by the fire block of course...
...think about it.

Level 84

Not that tough.  There's a diamond on the ground so it has to be killed but there are fire blocks everywhere threatening to burn anything you move towards it.  So why not just move those pesky fire blocks out of the way?

Level 85

Nasty stuff. This level's all about manouevering, so get rid of all the ice ASAP.  You need to kill that bottom club and diamond by making a safe path for it's mate through the field of fire and, as always, there's only one way to do so.  Remember the benefit of having a charcoal block below a ledge compared to a fire block, if you want to move stuff over the ledge..(hint hint)...

Level 86

Tough. The fire blocks cannot be allowed to sit there in the middle of the level burning stuff but they become just as much of a nuisance with a charcoal block sitting on top of them clogging things up.
If only you could get rid of the ice, then you could have both fire blocks sitting side by side on the bottom of the level, two charcoal blocks on top of them making a bridge...the easy life.  If only...

Level 89

The ultimate 'ledge' level.  That captive diamond on the right cannot be reached without making the largest ledge you've ever had to.  Be careful with what you crack, make that bottom middle diamond into helpful charcoal, and you've got a chance.

Level 90
A nightmare level.  All those blocks poised to match up once you move anything means, in our perverse Addled logic, that you need to preserve and use those top blocks very carefully.  You need to always have a ledge available to get blocks onto the fire block which means that, although initially you can use ice, you're going to need something harder if you've got to burn a lot of blocks.  Oh and guess what? You have to burn a lot of blocks...