Think of the play area as a room viewed from above. When you slide your finger across the screen, the floor slides by one step in the same direction. This is made apparent by the checkerboard tile pattern.
When the floor moves, the balls move with it. Balls are the only objects that actually move; the square blocks, and the striped area indicating the goal, stay fixed in place.
I like that there are many small 5x5 puzzles, though there are larger ones too. The big problem is that there is no sense of progression through the game, since the difficulty of the puzzles is unpredictable. Some of the puzzles are elegantly laid out and require accurate planning, but they are intermixed with many which are quite uninteresting, not posing any challenge at all. The puzzles seem to be a completely random selection with no underlying logic.
You also have to unlock the undo/redo functionality using an in-app purchase. Since that functionality has limited usefulness in the game, I wonder why the developers bothered to add this complication.
Overall, I liked some of the puzzles, but I think they should have been selected more carefully. Blockhouse, for example, has similar mechanics but much better level design, so you might want to take a look at that one first.
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