Fire up your time machine and visit your 12-year-old self. Tell him that all the computer games he's saved his hard-earned allowance for will one day be free. Stick around to watch him cry, but try not to create any time-space paradoxes -- we've got gaming to do.
Below, check out our list of official remakes, ports and offers of classic video games that found new life on social platforms and free sites.
Have we missed any? Share your favorites in the comments.