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Diamonds of four also clear, so there are some really interesting shapes that come from the combination of 3x lines and 2x2 diamonds.

ohhhh, wow, that changes everything!! I was having such a hard time getting rid of

X  X
  X

arrangements, trying to extend them to either side...

Is there somewhere that documents this, or do most people just find it out naturally?

I think a lot of people figure it out with some experimentation, but not everybody! I was thinking figuring it out would be part of the fun, but after some feedback I may put in a little "tips" page or something in the game to make sure.