Slide and Unblock! Unlock red

Unblock is a logical game.
The goal is to get the red block out of the board by sliding the other blocks out of the way.
Unblock comes with 5 difficult levels.
There are 5 categories of difficulty.
Each categorie has 200 levels.
Each level has 9 puzzles(tasks):
8 puzzles 6x6 and 1 super-puzzle 7x7.
There are total (5x200x9) = 9000 tasks.
The easiest tasks are solved in 6 moves.
The most difficult - in 50 moves.
The "Solution"-button is available for free (!) for all tasks(puzzles). No limit.