MGS Co-Op Mod After 28 Years: Sneak With a Buddy on the Go

MGS1 has been a solo act since 1998, but modder Felipe just changed that. A pre-alpha trailer shows two Solid Snakes sneaking through Shadow Moses, fighting Genome Soldiers, and facing Revolver Ocelot in what’s billed as a ‘world first’ for the PS1 classic. Built on the GOG PC release, the mod grants each player their own camera, scales boss HP for duos, and plans increased guard reinforcements. The final Jeep chase will reportedly stay single-player — a fair trade for getting online co-op into a 28-year-old game.

For handheld players, this is more than spectacle. The GOG version is DRM-free, so it can run on a Steam Deck, ROG Ally, or Legion Go — the only portable class of hardware where a mod like this will ever exist. The catch: custom netcode and compatibility layers don’t always get along, so the distance between ‘the game runs’ and ‘co-op runs well’ could be significant.

The Modder Did the Hard Part: Rebuilding MGS1’s Rules

Don’t underestimate what per-player cameras mean for a game framed around single-player sightlines. MGS1’s fixed angles were choreographed for one Snake; splitting them between two people breaks the intended language of every stealth encounter. Felipe isn’t just layering a second character on top — the mod rebalances boss HP and adjusts guard reinforcement counts, a sign this is aiming for designed co-op rather than a hacked-on novelty. Building on the GOG PC release instead of a PS1 emulator was the right move: direct access to game logic opens the door for skin mods and community extensions, while an emulator-based hack would have been trapped inside a translation layer. The Jeep sequence staying single-player is an honest concession to scripted pacing — some moments in Shadow Moses simply don’t bend for a second player.

Proton Is the Boss Fight Steam Deck Players Will Face

Windows handhelds have the easy path: ROG Ally and Legion Go run the GOG executable natively. Steam Deck players will need Heroic or Lutris for the DRM-free files, plus a Proton version that cooperates with the mod’s custom networking. That’s the real wildcard — bespoke netcode often stumbles over Proton’s socket handling and NAT traversal, and Felipe hasn’t published Deck-specific performance notes. Treat early builds as ‘might run on Deck’ territory, not a verified badge. Switch owners are locked out entirely; the Master Collection’s closed ecosystem doesn’t accommodate community mods, even as MGS Master Collection Vol. 2 delivers more of the series on Switch 2. The kicker: MGS1’s codec-heavy pacing, where radio calls pause the action, already suits a handheld session. If the netcode survives contact with Proton, this becomes one of the strongest arguments yet for owning a PC handheld.