I build my first Android game and I wanted to build something special. I found a game I had never heard of before and built it into an app.
The game I found is called Think-a-Dot. It is a puzzle game with 127 levels where you are challenged to match the small pattern by dropping marbles in the right entries which will change the colors in the large pattern. Each hole in the large pattern contains a switch which is changed when a marble passes. This causes the marble to take a different route the next time (enable the Look inside option to reveal this mechanism).