Ocean Express is inviting you to tour from city to city, fitting puzzles together as you go. In each city, you'll fill ocean barges with puzzle pieces, and as you do you earn upgrades and special pieces. You can play in a relaxed casual mode and take your time, or you can challenge yourself with express mode, which requires you to place the pieces quickly and fill your barge in a more limited time.
You'll never run out of puzzles, because the game will automatically download new ones if you wish; and you can design your own puzzles as well. You can also compare your high scores with daily and all-time highs from players around the world.