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These days it's common for games to be graced with downloadable content – extra features you can get online to breathe some new life into existing titles. Before the Internet was so commonly used, however, developers dreamt up some innovative ways of updating their games...

25 years after Sega released Sonic & Knuckles, Andy looks back at the advent of downloadable content and the ways in which developers gave their games a new lease of life when data wasn't so easily distributable by using hardware and lock on technology.