There are fun and addictive games which seem really easy to code, and in most cases they are
"This is the case of 1+2=3 game for iOS. This is a very simple math game which all the questions and answers are combined by 1, 2, 3, plus and minus. You just have to tell the result of some simple sums like 1+1, 2+1, 3-2 and so on. You will always be using only 1, 2 and 3."
