GOG are celebrating their sixth year of operation this week, and will be celebrating the occasion by discounting different sets of games each day:

For six years now, we’ve been building a library of great games of many genres, ages, and origins. One by one they were introduced to our catalog, publisher by publisher, developer by developer, series by series. We’ve started small, with just a couple dozen of games and a small crew of passionate gamers. Then we grew. Each year was exciting and brought excellent additions to our offer. This week, we’d like to go back to GOG.com history, taking you on a little trip down the memory lane. Each day we’ll be taking some of the games we’ve released in a given year of GOG’s existence, and offering them to you up to 80% off.

The so-called “Year One” sale is on now, and for the next 14 hours. What titles does it include?

It was 2008 when we’ve launched our service to the public, offering a modest collection of golden classics that every PC gamer would instantly recognize, in other words: the Interplay catalog. During the first year in business (September 2008 – September 2009) we’ve released a nice number of exciting titles…including Beyond Good and Evil, Heroes of Might and Magic 3: Complete Edition, or Jagged Alliance 2. You can grab them – and many more – up to 80% off – from our 6th Birthday Promo page, today!

They’re also hosting a “game video” contest, and are inviting everyone to submit short videos presenting a game, from the GOG catalogue, that is near and dear to their heart. There are a few submission guidelines; you can find them here.