Hi, Merry Christmas.
I'm looking for a story mainly set in the USA. Suddenly portals open up where you are transported to D&D type adventures. The MC sets a team up exploring the portals. You have different colour portals and different levels. Things found can be sold in real world. The US army set their own teams up and try to make it illegal to enter.
I believe I read it in the past few years but can't see it in my library