Puzzle

Arcade is great! A good addition could be a puzzle: an image (uploaded by the user) that is divided into a grid, and scrambled. The player must move the images to solve the puzzle as quickly as possible. For the results, players are sorted by the time it took them to solve the puzzle. The same logic can be used both for images and for sorting elements (ordering events chronologically, countries by population, or whatever elements according to a set criterion)