Spartan Loop

You wake up by the campfire on Timber Hearth as before, but you're wearing MJOLNIR armor. A minute later, Covenant drop pods streak across the sky.

Spartan Loop puts Halo: Combat Evolved inside Outer Wilds. The Chief, the Covenant, the weapons, textures, sounds and music are all read from your own copy of Halo: The Master Chief Collection every time you play.

What you get

• You are the Master Chief. Halo CE's energy shield (75 points, recharges after 5 s, with CE's shield sounds) sits in front of Outer Wilds' health.
• Halo CE weapons in first person, held in the Chief's own arms with Halo's animations: MA5B Assault Rifle, M6D Pistol (2x zoom) and Plasma Pistol (overcharge and overheat). Magazines, fire rates, spread, heat and damage come straight from the weapon tags in your copy.
• Covenant drop pods every loop. Grunts, Jackals (with energy gauntlets) and Elites (with recharging shields) land around the village, across Timber Hearth, on Attlerock, Brittle Hollow and the Hourglass Twins. They have their real models, animations, voices and health; they hunt you down, and Grunts panic when their Elite dies.
• Halo CE HUD: shield bar and health, ammo counter, plasma heat, reticle and motion tracker.
• Halo CE's classic score: the drop alarm, combat music, and the "Halo" theme when a drop site is cleared.
• The loop resets the war: when the sun explodes, the Covenant come back next loop.
• Co-op for up to 4. Friends join the host's loop as Spartans. You see each other as the Master Chief carrying your weapons, fight the host's Covenant together, and connect over Steam's relay network. Press Play together on Melty, with no addresses or port forwarding.
• Keyboard and mouse, or a controller.

Controls

Keyboard and mouse: 1 / 2 / 3 draw the Assault Rifle / Pistol / Plasma Pistol. Left mouse fires (hold to overcharge the Plasma Pistol), right mouse zooms the pistol, R reloads, H holsters.

Controller: d-pad left / up / right draw the Assault Rifle / Pistol / Plasma Pistol, and d-pad down holsters. RB fires (hold to overcharge the Plasma Pistol), LB zooms the pistol, B reloads. Movement, jetpack, tools and the ship keep Outer Wilds' usual controls. With no Halo weapon out, RB takes out the Scout Launcher as usual.

Refuel at the ship for bullets; walk over a fallen Covenant's Plasma Pistol to recharge yours.

You need

• Outer Wilds (Melty installs the OWML mod loader).
• Halo: The Master Chief Collection with Halo: Combat Evolved installed. Nothing from Halo ships with this mod, and MCC is never started or changed.
• Internet co-op needs the Steam version of Outer Wilds on every PC.

Credits

Made by Patoche, built with Claude Code. Halo: Combat Evolved © Microsoft / Bungie / 343 Industries, and Outer Wilds © Mobius Digital / Annapurna Interactive, both read from your own copies. OWML by the Outer Wilds modding community. Bundled sound decoder: vgmstream (ISC; its libraries are under their own licenses, see THIRD_PARTY_NOTICES.txt). Halo CE tag layouts from Invader's definitions (SnowyMouse).