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I do not know about algorithm glitches nowadays. There was a big one sometimes like a year ago which if you changed the time in your mobile gave you unlimited boosters for a few hours or a day, I do not remember. But King got rid of that.
Yes I saw that discussion about the weekly contest. Well I am not sure that the guy was bragging about the incredible number of levels passed . He might have been genuinely shocked by that result which might have nothing to do with his cheating. It actually looked very much like the consequence of unvoluntary CCS profile merger on Facebook. One of my friends here experienced it and ended leading the weekly contest with an astronomical number of levels. Needless to say, he had not won those levels, had not cheated in any way and he never got the reward for it. It is a kind of "technical" win, not one that provides you with rewards.