This program is a clone of the very famous mobile game, Flappy Bird. It was surprisingly easy to make. The bird itself is a square, and the pipes are just rectangles. Since you only need to check for collision on the y-axis that the bird is on, it's very trivial to implement. Generating pipes just involves some random numbers along with some fine-tuned settings to avoid having height differences between pipes that are too large or too small. Performance is not an issue either, since there are at most a few pipes that exist at once (once a pipe leaves the screen, it stops existing in memory). Finally, rendering is also very simple, since everything is just rectangles. To make the game more addicting, I also added an option to restart when you lose.