The catch is that you can only slide lines that contain at least two pieces. So for example in the following position you can only move the second row and the second column; all the other lines contain only one piece and therefore are blocked.
The game contains about 300 puzzles, which are all unlocked from the start. I think none of the puzzles is larger than 5x5, which is great.
They don't seem to be sorted in any particular order. While there are longer ones requiring up to 14 moves:
The most obvious shortcoming of this game is the presentation: this is more a prototype than a fully polished game, and the graphics are particularly lackluster.
The controls are responsive, apart from the puzzle list which is not on par with the standard iPhone interface.
I think it could have been useful to give some visual feedback when the user attempts to move a line which is blocked.
A minor annoyance is that if you move one of the pink blocks over the goal it will conceal it completely. If you get distracted while playing, it's easy to lose track of where the goal was, so it can be simpler to just restart the puzzle than to move lines at random looking for it.
Despite the lack of polish, the novel mechanics are good enough to make this game worth the purchase.
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