The Steam Summer Sale is back, along with a total of 14 (I think) free trading cards which can be earned.
Earn these free trading cards by exploring your discovery queue.
You can also obtain trading cards by:
Craft a game badge
Starting June 16th, crafting a game badge earned you a mystery card rather than a coupon, so if you crafted a badge in the last week you’re already ahead of the game. During the sale, each game badge you craft will get you an additional Summer Sale card.Make a purchase
As an extra reward for purchasing, for every $10 USD spent during the sale you’ll receive a Summer Sale trading card. From your Summer Sale 2022 Badge page select “How do I get more cards?” to track your purchasing progress.Trade for them
That’s why they’re called trading cards! Find friends with other cards and make trades. Your Summer Sale 2022 badge page shows which friends have the cards you need.Buy them from the Community Market
Sell the cards you don’t need and buy the ones you do, all with other Community members on the Community Marketplace. Turn those duplicate cards into Steam Wallet funds to buy games.
If you're also interested in the Clorthax's Quest thing, where you have to find the games, here's the answers from Reddit:
Clorthax's Quest.
CLUE 1: You'll find riches in rhythm, and fame in six strings. But beware the tax burden axe mastery brings
Editing in Clues and answers: Each Storepage thumbnail say -50% CL.OR crossed out with a green price of TH.4X.
Clue 1 Answer: Guitar Billionaire
Clue 2: You've settled a city and put down your roots. But now can you settle small legal disputes?Answer 2: Custard Castle Small Claims Court
Clue 3: Sport is the angle The bait the allure Success the disease And you are the cureAnswer 3: Bass Ain't Bitin' 2022
Clue 4: Maybe you managed to shut down your rivals. Your lucrative theme park’s still dead on arrival
Answer 4: Dead Seagull Zoo Magnate
Clue 5: A know-it-all’s monstrous need to correct you. Will give you and your friends a lot to object to
Answer 5: ACTUALLY… Frankenstein's Monster Edition
Clue 6: No actions to take or choices to make. This passive adventure prefers that you wait
Answer 6: It's Probably Fine
Clue 7: Your role in this realm. Is to guide your king true. To sit on his throne. Or mayhap on two
Answer 7: Help Get the King to the Toilet
Clue 8: The horror the horror, pretentious explorers. This one’s the father of all arty snorers
Answer 8: The Consecration of Esthme
Clue 9: This virtual river has a full boat conveyed. Two princes that paddle with three little spades
Answer 9: Pro Poker Amateur
Clue 10: If your strategy is to keep me close, I'll make you think. If your strategy is to let me go, I'll make a stink.
Answer 10: Hold In Your Farts: Could You Be My Next Champion?