In the world of vintage video games, factory-sealed copies often reign supreme and can sell for astronomical prices. But the chances of stumbling upon a pristine, unopened title in the loft or garage is a fantasy for most people.

The good news is that many of the titles we eagerly ripped open and played for hours on end are now fetching remarkably high prices, according to new research from Currys. Read on to discover 20 used boxed and loose video games selling for small fortunes, and find out if your retro collection could make you some serious cash.