Try this....in Google select IMAGES, then type in Nadelstern Puzzle Quilts. You'll get a lot of quilt pictures.
The puzzle quilts are the ones with 12 blocks in a quilt. The premise is there are 6 patterns and using different fabrics you can create very different looking blocks because of the colors you choose, the "line" or patterns in the textiles, etc.
The puzzle comes from the "game" you play matching up the various pairs of blocks. Should be fun! Harriet, Kansas