Final Call: Steam and Epic Users Have Until December 30 to Claim These Free Games

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As the 2025 holiday season winds down, digital storefronts are issuing a “final call” for several high-value freebies. If you haven’t checked your libraries today, December 30, 2025, you are down to the final hours to claim a permanent addition to your Steam collection and participate in the ongoing Epic Games Store mystery giveaway.

1. Steam: Caveman World: Mountains of Unga Boonga

Steam users have until 10:00 AM ET on December 30 to claim the retro-inspired platformer Caveman World: Mountains of Unga Boonga for free.

The Deal: Typically retailing for $1.99, the game is currently 100% off as part of a GrabTheGames publisher promotion.
The Catch: Once you add it to your library, it is yours to keep forever. However, copies obtained during this free period will not drop Steam Trading Cards.
The Vibe: It’s a classic prehistoric adventure featuring various levels, traps, and bosses. With “Mostly Positive” reviews, it’s a lightweight, nostalgic addition for platforming fans.

2. Epic Games Store: Viewfinder and The Mystery Reveal

The Epic Games Store’s “17 Days of Free Games” event is reaching its final stretch.

Expiring Now: You have until 11:00 AM ET today to claim Viewfinder, a critically acclaimed first-person puzzle game that allows you to reshape reality using a polaroid camera.
The New Mystery Game: At 11:00 AM ET, Viewfinder will be replaced by a new mystery title. While Epic keeps the official identity a secret until the timer hits zero, prominent leakers (and the in-game wrapping paper teaser) strongly suggest today’s freebie is the award-winning space-exploration title Outer Wilds.
Coming Soon: The leaks also point toward Dying Light 2: Stay Human (Dec 31) and the Batman: Arkham Collection (Jan 3) as the grand finale of the event.

3. Amazon Prime / GOG: Deus Ex and More

If you are an Amazon Prime subscriber, today is also a major “drop day” for free PC codes redeemable on GOG and the Epic Games Store:

Game	Platform	Status
Deus Ex: Mankind Divided	Epic Games Store	Available starting today (Dec 30)
Dreamscaper	Epic Games Store	Available starting today (Dec 30)
Living Legends: The Crystal Tear	Amazon Games App	Available starting today (Dec 30)
Fallout & Fallout 2	GOG	Still available to claim from Dec 23

Conclusion: Check Your Timers

The most urgent of these is Caveman World on Steam, as it will return to its paid status shortly. For Epic Games, remember that these are 24-hour windows; if you miss today’s window for Viewfinder or the subsequent mystery game, you cannot go back and claim them later.