Just got my box in the mail. This set contains over a dozen thick card-stock dungeon tiles and rooms for the D&D4 game. Some are reprints of previous dungeon tiles but no matter, this is meant to be a core-set. If you are new to D&D 4 then you should pick this up, it has enough tiles for a modest sized dungeon crawl game. I'll probably pick up a second box set to expand my tile sets. What is excellent about this set is that the box itself is a large sized dungeon room (both lid and box). While I still use a battlemat this is great for adding more atmosphere for specific dungeon encounters. Wizards D&D are really putting out good quality products with this Essentials line. While touted for D&D this set could easily be used for other fantasy RPG games like Warhammer or Pathfinder too.