This game is really interesting to play. Its rules are simple, but result in rich dynamics. To progress towards the goal, at each move the player select a tile of a "domain" (group of tiles of same value). This tile increases value and the rest of the domain disappears, making room for new random tiles from the top. An important part of how the player can influence the game is that the player chooses which tile of the domain they play, which decides where the new tile appears and where disappearing tiles cause other tiles to fall, creating new opportunities for aligned tiles of the same value -> new groups. This makes possible to "clear out" obstructing tiles in various ways. Watch out not to "break" interesting domains by removing tiles under some parts. First moves are really easy and provide a quick intuitive understanding, yet difficult gradually increases, maintaining a nice level of challenge and thinking all along.  
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