Artistic and challenging. There are 8 dinosaurs that must fit into the square space. If you never saw it solved, 30 minutes would be a good solution time. The dino creatures are approx 1/4'' thick and there will be at least 4 different woods used. The woods will vary in each puzzle. There may be oak, cherry, maple, mahogany, alder, teak, or some other exotics. Puzzle measures 7'' square in the base. (This design does not include a cover.)