Like Drugs
The description of a good game is when you really like it and it´s hard to stop playing.
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I´m not sure that I´m so found of this game, but I REALLY CAN´T STOP PLAYING IT, and I´m wasting my life and time on it. That would be the adequate description of drugs?
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However I think you should explain the "special blocks", Maybe I´m stupid, but it took me a while to figure everyone of those out.