I really wanted to like this mat, it seemed a much better option than the cheap paper mat game board that comes with Mars Attacks! base game. However, the mat is shipped folded several times in a plastic bag which creates what appear to be permanent raised fold creases to "pucker up" instead of the mat lying flat. None of the scenery supplied with the base game will stay standing because of these raised folds, and no matter what I try, I just can't get rid of them.I gave it 2-stars only because I'm still hoping to find some way of eliminating the folds. I had planned on purchasing more of these, but until the fold issues are resolved, I would highly recommend staying away from these. There are other mats available that are shipped rolled instead of folded, but they don't come with the 3" square grid required for Mars Attacks! (really stupid idea game designers). You may be able to use a permanent marker and draw your own grid on these 4'x6' mats, or convert the Mars Attacks system from squares to standard miniatures style linear measurements for movement & ranges.UPDATE 1/23/2018:I've had the mat sitting under a couple of pounds of game boxes for well over a year, the folds are still there....removed a star.