GameStop has declared several early 2000s gaming systems officially “retro,” marking a new milestone in the evolution of modern video game hardware.

In an announcement, the retailer said the Sony PlayStation 3, Xbox 360, and Nintendo Wii U are now classified as retro consoles under the company’s internal standards.

GameStop said the decision followed an analysis of several indicators, including the age of the systems and features associated with earlier generations of gaming hardware.

Under the classification, the consoles join older legacy systems such as the Sega Saturn and Nintendo DS in the retailer’s retro gaming category.

To mark the designation, GameStop announced a Retro Trade-In Bonus promotion running through March 21. Customers who trade in Wii U, Xbox 360, PlayStation 3 or older consoles, games or accessories will receive an additional 10 percent in trade credit.

The company also said stores will now accept defective retro consoles for trade as long as they are able to power on, even if they are missing accessories or have cosmetic damage.

GameStop noted that while the systems are now considered retro, they remain popular among gaming enthusiasts and collectors.