Black Desert Online
You can score yourself a free copy of Black Desert Online, the popular MMORPG from Pearl Abyss and Kakao Games. Of course, there is a bit of a catch here.

In order to earn a free copy of the game, you need to complete the "7-day trial challenge." The challenge tasks you with getting a character to level 56 over the course of their free 7-day trial. If you do it before your trial expires, you get the game for free. It's just the starter package valued at $9.99 (USD), but it's still a free copy of the game that you can keep permanently. I just have to wonder how many people will feel a bit burnt out after rushing through 56 levels in under seven days.
Players who start playing Black Desert Online between the 3rd of October up until the 17th of October, reach level 56 on a character and complete that character’s awakening quest before their 7-day trial expires will be rewarded with a free Starter’s Package that has a $9.99 / €9.99 / £7.99 value*.

Recently the game received a major upgrade both in terms of graphics as well as in audio with Black Desert Online Remastered. It has never been a better time for adventurer’s to step in as the game will receive exciting new contents such as the upcoming Drieghan Expansion that will feature more than 300 new quests and a new dragon world boss. It was recently announced that the Drieghan Expansion will be launched on the 14th of November.

Aside from the free game package promotion, players can save up to 50% on rare items offered by in-game NPC Patrigio and can take part on the Kamasylvian Alchemists event, the latest installment of the yearly alchemist challenge where players can earn fantastic rewards.

That little asterisk in the above quote? Yeah, that says that this promotion is NOT available through Steam. So, if you want to participate, you need to hit up the Black Desert Online official website and start it there.