Reach Ops

Hold out on Halo: Reach's Courtyard against waves of Grunts, Jackals and Elites, armed with Black Ops III's guns.

What you get

• Reach Firefight on Courtyard: 3 sets of 5 waves that repeat harder, shared lives, wave rewards and the Reach Firefight announcer.
• The Covenant from Reach: Grunts with plasma pistols, Jackals with needlers, and Elites with plasma rifles and recharging shields. Each uses its real model, voice and weapon sounds.
• Black Ops III's arsenal: start with the KN-44 and MR6, then grab the Vesper, Locus and KRM-262 from weapon crates near the spawn. Real BO3 models and textures, fire and reload sounds, aim down sights, and BO3 multiplayer music between waves.
• Reach Spartan shields and health, with Reach's own recharge times.
• Co-op for up to 4. Join puts friends straight into the host's game, and nobody has to forward ports.

You need Halo: The Master Chief Collection with Halo: Reach installed, and Call of Duty: Black Ops III, both on Steam. Reach Ops reads everything from your own copies each time it starts. Nothing from either game is in the download. The first start takes about a minute; later starts take about ten seconds.

Neither game is launched or changed: Reach Ops is its own program that rebuilds Reach Firefight from your files.

Controls: WASD move, Space jump, left mouse fire, right mouse aim, R reload, E take a crate weapon, 1 / 2 / mouse wheel switch guns, Esc pause.

Playing together: to find each other, the host and joiners swap network addresses on a public ntfy.sh topic named after the game, then connect directly over UDP.

Built with Java and LWJGL. Halo file formats were worked out with Reclaimer and Assembly, and Black Ops III's with Greyhound (all GPL-3.0). Halo is Microsoft's and Call of Duty is Activision's. I'm still making updates so I'll do my best to make it better add more guns and fix bugs.