The Game Boy is now 25 years old -- What's your favorite memory?

Nintendo released the original Game Boy on April 21, 1989, meaning the beloved brick-shaped portable device is now a quarter-century old.

According to the latest official numbers, Nintendo has sold over 118.69 million units (including Game Boy Pocket and Game Boy Color) to date, along with 501.11 million pieces of software.

The original Game Boy came bundled with Tetris. It wasn't the first portable gaming device on the market, but it is considered to be the first to gain mainstream appeal.

Nintendo would later release the Game Boy Advance in 2001, which would go on to sell over 81.5 million units worldwide. The company's success in the portable market continues, as the original DS line has shifted over 153 million units, while 3DS sales currently stand at nearly 43 million systems.

Did you have an original Game Boy? What's your favorite memory of the device?