We've seen this type of puzzle many times in the past. See links below.
1. Look at the first image. See the green square with a green dot in the middle? The green circle will die if he lands on it.
2. Same image: the red & yellow circles must unite and then land on the orange home.
3. You can create your own levels and share them with the world.
There are 200 levels each worth 3 stars. At the moment I have 105 stars. I'm stuck on level 47, which is a tiny grid. How hard can it be?!
Similar games (this list is incomplete):
Movez Pretty much the same as Block Mania but it has 1680 levels. I've solved 592 of them. That's probably enough.
Frozen Ice Cubes What's different: there's a point of 'no return'.
Vubu What's different: the vubu men have different powers. Very sophisticated, very intelligent. Possibly the very best in this genre.
Escapology, reviewed by Nicola Salmoria. He told me about this game ages ago. I played it and enjoyed it, but never blogged about it.
Block Mania Similar to Movez
Move Puzzle - A Funny Strategy Game, Matching Tiles Within Finite Moves