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Halo Online is PC based FPS based on a modified Halo 3 engine, just like most halo games are. It’s multiplayer only, but it’s same types of playlists you’d expect to find in a Halo game. Some more details in 343’s blog post from last year:
https://www.halowaypoint.com/en-us/community/blog-posts/halo-online-closed-beta-launching-in-russia