Ambar and sliding puzzle

Ambar got hold of a puzzle and is desperately trying to solve it. The puzzle consists of a grid of 3 x 3 cells, with exactly 1 cell empty. The other 8 cells contain a distinct number in range $1...8$. It is allowed to move a cell adjacent to the empty space, which would create an empty place where that cell was present before the move. The goal of the game is to have the cells read $1..8$ readin