Pixdeluxe/Getty Images

We may receive a commission on purchases made from links.

Keychains offer a way to decorate a backpack or key ring and come in all shapes, sizes, and colors. There are even keychain video game consoles that come with a selection of retro games to play — one keychain that doubles as a miniature handheld where you can play games, and one that teaches you how to code them as well.

The TinyCircuits Thumby is a compact and lightweight keychain that is also a handheld gaming console. Imagine a much smaller Nintendo Game Boy with various different shades of color and you'll get the idea. Outside of letting you play games such as "Snake" and "Pong," the Thumby also teaches you how to code your own video games, and it does this all for a price of around $30. By using its free in-browser code editor, users can code games using MicroPython.…