When I first saw Martian Coasters, my thought was "Oh, what a shame - they made the arrows Xeno colours, but if you bought the IceTowers Boxed Set, you've got Clear and not Orange..." I do have a suggestion though... make some Martian Coasters that are the opposite colours (So you have Purple Squares and Yellow Arrows - likewise for all other coasters). Obviously this set could still be used with either Rainbow or Xeno stashes, but could then be combined with the standard type for a 8 or 10 player game. In fact, you could publish an alternate game that is essentially a "game that uses martian coasters" with this alternately coloured set. Hmm... am I making sense, or am I just rambling now? Timothy