Specifically, once you've played puzzles of this sort, it is easy to see that the core of the puzzle is that all the tiles move as far as possible on a move. That threes doesn't do this makes it look like the prototype, no matter how much thought went into it.
Threes then seems more like a combination of this concept and a 15 puzzle.
> Specifically, once you've played puzzles of this sort, it is easy to see that the core of the puzzle is that all the tiles move as far as possible on a move
I see. That's now how I play so I wouldn't have thought of that.
Threes then seems more like a combination of this concept and a 15 puzzle.