Maxwell's puzzling demon

What this puzzle is like.Maxwell's demon is the main character of this puzzle.
The demon does work to push the blocks to target location.

Blocks have temperature. Some blocks are hot and others are cold.
While the demon doesn't like hot blocks, they can be cooled when adjacent to cold ones.

Keep your blocks and head cool.This game has 10 worlds.
Each world consists of dozens of levels, which are more than 250 in total.
The level blocks are located in several groups in different corners of each world.

In this game, not only levels but also worlds themselves are puzzle.
Those levels once solved becomes pushable blocks.
You then use the blocks to access the next group of levels.

If you want more challenging ones, extra levels await you.
We're sure that it's difficult to even reach them.
(Don't worry. You have neither to reach nor to solve them to clear this game.)