Not sure when the promo codes expire but new codes are released every ~2 weeks as far as I can tell. Will update or make a new post if so.
Wide selection of hidden object, adventure, puzzle, arcade, word, strategy, etc. games on offer. I downloaded two Nancy Drew games - highly recommend if you like point and click adventure games!
To download a game:
1. Select a game and click "buy now"
2. Sign up or log in to Big Fish account
3. Unselect "Big Fish Game Club Free Trial" and apply coupon code
4. Download free game (This will automatically install the Big Fish Game Manager)
No billing info is required.