Milton Bradley, a company then better known for Hungry Hungry Hippos than video games, has the distinction of being the first to introduce a handheld video game console with interchangeable cartridges with its Microvision.

ENGADGET: A Brief History of Handheld Video Games

The video game industry has progressed over the years from cartridges to CDs to DVDs to Blu-rays and now the next step has been clear for a while now.

FORBES: Sony Says It's Still Not the Time for a Purely Digital Console