After flinging avian creatures no longer provides a suitable outlet for your mental acumen, you may wish to graduate to a more challenging level of iPad gameplay. Might we suggest moving crates? Seriously, though, while the premise behind Cargo-Bot may seem effortless, it's actually nothing of the sort. In the game, players must program a crane to properly situate boxes, but with the help of loops and conditional variables, it rewards players for discovering the most efficient method. We definitely dig the idea behind Cargo-Bot, but what makes it truly unique is the fact that it was programmed entirely on the iPad with Codea -- which also makes it a first of its kind. Go ahead and check out the free app for yourself in the source below, but if you need a bit more convincing, just hop the break for a quick premise of the game.