A The Diary Steam Key — also known as a CD Key or digital code — is the official activation code you redeem on Steam and keep in your library permanently. From €7.55 (-52%) at Difmark, Steam Account format · Cheapest official key: €8.55, 46% below the €15.79 Steam price · 4 verified stores, 4 offers in stock · Updated 01h 19min ago.
The Diary is a 2D suspenseful narrative puzzle game that revolves around several distinct "diaries," including a journal full of life but full of doubts, two investigative notebooks written by different people, and the planner's diary, which will all be displayed before you.
By solving each page's puzzle, you will turn the pages and gradually gain insight into a heart-stopping missing case. From different perspectives, you will uncover the buried past behind the case.
· Open an unknown diary and search for its owner while solving puzzles
· Among 6 characters, whose perspective are you reading the diary from?
· With multiple reversals, the answer may be right in front of you or it may never appear
The Diary for PC starts at €7.55 at Difmark, 52% under the €15.79 of the official store — but that is a shared account, not a key of your own. If you want a key tied to your own account, the cheapest is €8.55 at Kinguin.
That €7.55 already includes the Gocdkeys coupon, so apply it at checkout or the store will show you a higher price.
Only 4 offers across 4 stores carry it, and thin supply means the price barely moves.
That puts it 31% under its average of €10.99 since 2026, so today is a better entry point than most days of its life.
That €8.55 key is at its usual price: no bargain, no spike.
Worked out from 227 daily records of the Steam Key for The Diary across 2 stores. See the full price history.
The price does not include each store's payment fees. The percentage is measured on the store price, without coupons, because that is how we record the history. The analysis only counts Key offers. Shared accounts, Steam Gift and physical editions stay out, because they are not the same product and their prices move differently.
With the shared account at Difmark you log into an account that already owns the game: it is the cheapest route, but it never becomes yours and the seller keeps the credentials. If they ever lose or change them, you lose access.
The key at Kinguin costs €1.00 more, but you redeem it on your own account and the game stays there for good. That is the difference between renting and buying.
The 1 Steam Gift offers are pricier than the key and leave more room for error, because they depend on the region and on Steam friendship.
All 4 offers are Global, so the code redeems on any account no matter where it was created.
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