The diagram above pretty much sums up what this puzzle is all about. Fit the pieces into the blue square above.
There are 10 different grid layouts. One is a cross. Within each of those 10 grids there is an infinite number of puzzles.
The puzzles are not easy to solve. Fortunately, you can get a hint in the form of 1 puzzle piece being placed in the correct position. I have solved 1 puzzle in each category.
It's a bit like the recently reviewed Fish Crackers. If you like that, then definitely give Perfect Tiling a try.