Developer Mitchell Hynes has released a free, unofficial browser port of the original Xbox version of Halo: Combat Evolved, and it looks like the full campaign is playable. Hynes announced it on X, listing working split-screen co-op and multiplayer for up to 128 players, though he flagged the latter as untested. His post also promises "no Gearbox Master Chief," which seems to reference the Gearbox-made 2003 PC port. Hynes also warned that the port doesn't run well on iOS or Android, so PC is the recommended platform. The game reportedly saw nearly 20,000 plays in its first five hours across 115 countries, averaging 94 FPS.

Early reports say the campaign works well, although one tester had less luck with the 128-player mode. The original Xbox release topped out at 16 players in competitive multiplayer, so 128 is a big jump. The port builds on the recent decompilation of the original Xbox game. If you want to go the official route, Halo: Campaign Evolved launched on July 28 for Xbox Series X|S, PC, and PS5, but it is a campaign-only remake without the original's competitive multiplayer. I would wait for more testing before getting excited about 128-player matches, but it looks like a great time to jump into the campaign while it's still up.