Not out of the box — but the Sven Co-op mod makes it co-op. Half-Life is a sci-fi shooter game released in 1998, 97% positive on Steam (148,221 reviews), with 634 playing right now. $9.99 on Steam.
Free standalone on Steam; the whole Half-Life campaign in co-op. Steam lists Half-Life as single-player, so it won't show up in Steam's own "games we both own" view as something you can play together — Ready Up counts it anyway, marked "Via mod", and you can hide mod-only games with one filter if that's not your thing.
Named Game of the Year by over 50 publications, Valve's debut title blends action and adventure with award-winning technology to create a frighteningly…
Steam tags: FPS, Classic, 1990's, Singleplayer, Sci-fi, Multiplayer, Shooter, Action
Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Half-Life is one of them — then helps you pick tonight's game with a weighted roll or a bracket.
Compare our libraries Steam store pageTired of Half-Life? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.
Ready Up is a free tool: enter two Steam usernames and it lists the multiplayer games you both own, runs a bracket to pick one, and suggests new co-op games that fit how you both play. Ratings, tags and player counts from Steam and SteamSpy; updated 2026-09-08. Powered by Steam — not affiliated with or endorsed by Valve Corporation.