Level 142 - 'V'

Tricky. You need to use the ledges on the left hand side of this level to help set up the triple kills. Work out which ice blocks you need and which you need to destroy and work out how to get the normal blocks into those safe lefthand ledges.

Level 143 - 'W'
Aargh ! Frustrating level ! Not 'hard' as such, but annoying. You obviously need to burn some blocks here and pair up the rest, but it's just so easy to make one too many charcoal blocks and hem yourself in so badly in that bottom middle corridor that the level becomes impossible.

The lefthand column is harder to empty than the middle or right column so pairing up the blocks in the left-hand column is a good plan. 

Level 145 - 'Y'

Mega-hard. There are two loops in this level which split at the top and merge at the bottom. You need to know how to use both effectively.
You cannot complete the level in a few moves so you might as well resign yourself to lots of looping.
The three hearts cannot be killed if you kill any other blocks first, so avoid killing anything before the triple kill on the hearts.

Level 146 -'Z'

An easy enough level. It loops and it requires lots of burning so burn, break ice, get rid of charcoal and the rest's easy.

Level 149

Pain. Pain. Pain. F stands for 'F-ing painful'! If you see the trick to this level you'll complete it easily, but we're kind of guessing that if you're reading this then you haven't.

All we can tell you is kill the hearts first and the rest becomes easier.

Level 150

The ice in this level is needed for the triple kill but, of course, the ice in this level also gets in the way of getting all three hearts together.

You need to destroy lots of ice and also preserve quite a bit of it too but as long as you use the ice very carefully you will prevail !