Puzzles with fewer than 150 pieces (nice for a small break and small tables, great for gifting and for busy people who don't have time to have fun)
Puzzles with 150-250 pieces (nice for an evening's relaxation)
Puzzles with 250-500 pieces (nice for a an evening with a friend, or weekend puzzling if you can spare the table space)
Puzzles with over 500 pieces (puzzle projects that will take some table space!)