The latest Steam sale is underway now.

Steam's Monster Summer Sale runs until June 22, and includes some gamification: collecting trading cards by buying games you a chance to craft a "Summer Sale Badge", which you can use to fight monsters in the a mini-game.

Defeated monsters unlock special game discounts that apply to all of Steam.

It’s worth noting that not all discounts may be exactly as high as they seem. As detailed on the Steam subreddit, some publishers apparently increased game prices just before the sale so discounts look better than they actually are.