Not sure what the problem was with the previous reviewers? The need for glue was made clear when I bought these and likely explains their affordability. I also really can't fathom how one might say that Lego flame bricks (which I also own) are better than these. Other GMs and all my players love these things. I get compliments each time I pull them out at a Con. I bought one set and I am back to buy two more (one set for my player bag and another to put with my GM stuff).
I have to echo the previous review. I too received this as part of a subscription and was thoroughly disappointed. So much wasted potential. My head danced with visions of intestinal hallways, stomach rooms, pools of gastric acid, grinding gizzard traps and digestinal valve doorways. All surrounded by anatomically colored mystery organs. What we get are mostly monster outlines with a few 1" squares gridded in them. Sigh. As discussed by the first reviewer, there a few interesting tiles, but most are a bust.