To do that you can taking up the stairs or going down, but to be on the green pieces, you have to take the stairs before. You can slide the pieces, but remember a rule: if you are on a piece you cannot move this one, so you have to leave this piece to be able to slide it.
As you can see (or perhaps not, because the picture is not very big), there are some marks (round, cross, etc.) on the pieces, so that you recognize them better and that helps to put in the correct way the pieces to start a challenge. So everything is well thought and the quality is good.
There are not a lot of challenges and I find them rather difficult. Sometimes you can win the challenge by making more moves than required, so sticking to the required moves are sometimes not so easy...Luckily the solutions are provided in the small booklet.
Honestly, this is a good game, but I prefer City Maze (I've already reviewed it).
However, I am sure you will have fun with it, especially if you like the brainteasers from SmartGames and if you like sliding puzzles.