It is interesting to note that Cargo-Bot was created entirely ON an iPad using the App Codea. Codea is available in the App store for a 14.99 fee and is hailed as the "Garage Band" of coding.
Cargo-Bot is not new but I have found it to be more effective than many Apps out there. In a striking visual way CB breaks down the process of Coding. There are instant consequences when you don't think through your problem solving.CB also introduces the language of Coding along with the thought process.