From the campaign:
Complex 77 has been around for a little over a year now and continues to have repeated success with its PDF tile sets.
Now we want to bring you more. And that's what this Kickstarter is all about.
We would like to stress that this KS is NOT a pre-order for an existing unreleased product. Without your help and funding there is a good chance that the Complex 77 Tile Book series will not exist. We are using KS and asking for your help to aid us in reaching our goal by providing you with a quality product.