Expiring, see this deal: http://www.hotukdeals.com/deals/sunless-pc-4-75-free-play-until-sun-21-00-steam-steam-2619431
"Play for free until Sunday at 1PM Pacific Time" (21:00 Sunday GMT)
"LOSE YOUR MIND. EAT YOUR CREW. DIE.
Take the helm of your steamship and set sail for the unknown! Sunless Sea is a game of discovery, loneliness and frequent death, set in the award-winning Victorian Gothic universe of Fallen London.
If the giant crabs, sentient icebergs and swarms of bats don’t get you, madness and cannibalism certainly will. But that old black ocean beckons, and there’s loot for the brave souls who dare to sail her.
Betray your crew, sell your soul to a Devil, marry your sweetheart. Survive long enough and you’ll achieve your life’s ambition.
You will die, but your legacy will live on…"
If you like sailing spooky seas with the cries of the dead around you, whilst your crew slowly starve, this is for you.
As part of the promotion, it's 66% off (£4.75) until 18:00 Monday.
Reviews: Metacritic: 81% (38 critics, 7.5 from 115 users)
, Steam: Very Positive 83% (3910 reviews)