Steam has kicked off their annual winter sale and as you'd expect there are more great bargains to be had than we could possibly list here.
Some highlights include The Elder Scrolls series (60-75% off), The Witcher franchise (50-85% off, with Wild Hunt at 50% off), Grand Theft Auto V and ARK: Survival Evolved are both 40% off, great games that you may have missed earlier in the year like Mad Max, Tales from the Borderlands and Dying Light are 66% off. More recent releases like Undertale and Just Cause 3 are 20% off. If you can't get enough of Star Wars - there are multiple titles heavily discounted as well the Star Wars Collection that's 77% off.
Anyway, you can find all of the discounts over on Steampowered.com.