Steam Free Weekend Offers Four Multiplayer Games Until September 21

Steam's latest Free Weekend promotion gives PC players temporary access to four games through September 21 at 10 a.m. PT or 1 p.m. ET. The lineup spans a major action RPG, a pirate sandbox, a competitive multiplayer title, and a co-op sci-fi game, giving players several different ways to spend the weekend without paying upfront.

What happened

The promotion includes Diablo 4, Sea of Thieves, Last Flag, and Jump Space. Players can access each game as often as they want before the offer ends, but the access is not permanent. Anyone who wants to continue playing afterward will need to purchase the relevant game, with discounts available for three of the four titles.

This is separate from Steam's Free-to-Keep offers. Free Weekend games only remain playable during the promotional window, while Free-to-Keep games stay in a player's library after they are claimed by the deadline.

Why it matters

The selection is especially suited to groups. Diablo 4 supports solo play and co-op while sending players through Sanctuary to fight demons, collect gear, complete dungeons, and pursue its endgame activities. Sea of Thieves offers a shared pirate world built around voyages, treasure hunting, ship combat, and the risk of losing loot before returning to an outpost.

Last Flag provides a more focused competitive experience. Two teams of five hide their flags, use character abilities, purchase upgrades, and fight over the opposing objective. A successful capture begins a final 60-second defense, creating a clear climax for each match.

Jump Space is the most naturally time-limited-friendly option in the group. Its four-player crews alternate between piloting, engineering, exploration, combat, and repairs while dealing with changing mission conditions. The game can be completed within the promotion, although its broader content offers reasons to keep playing.

What to watch next

Players should prioritize the games they want to test before September 21, since the temporary access ends at 10 a.m. PT or 1 p.m. ET. Diablo 4 is discounted by 75 percent through September 24, dropping from $49.99 to $12.49. Sea of Thieves is 65 percent off through September 27, moving from $39.99 to $13.99, while Jump Space is 40 percent off through September 24, falling from $19.99 to $11.99.

Last Flag has no listed purchase discount and remains $4.99. Its shorter match structure may make it easier to evaluate during the free period, while the other three games are better suited to players deciding whether a larger ongoing experience deserves a purchase.

Key details for players

• All four games are available during the promotion until September 21 at 10 a.m. PT or 1 p.m. ET.
• Diablo 4 and Sea of Thieves are the broadest options for players seeking long-form co-op or multiplayer progression.
• Last Flag focuses on five-versus-five Capture the Flag matches with abilities and in-game upgrades.
• Jump Space supports four-player co-op and emphasizes managing a ship while completing missions.
• Access ends after the promotion, so players should use the weekend to test games before deciding whether to buy.

Steam Free Weekend lineup

Expert View

This is a strong Steam promotion because the four games serve distinct audiences without losing a clear multiplayer focus. Jump Space is the easiest recommendation for a coordinated group looking for a fresh co-op experiment, while Sea of Thieves offers the deepest sandbox commitment. Diablo 4 gives the lineup its biggest established name, and Last Flag provides the most direct competitive test. The temporary access window is short, but the follow-up discounts give players a practical path to keep the games that connect with them.