https://www.gamespot.com/articles/microsoft-is-celebrating-halo-3s-10th-anniversary-/1100-6453579/

Halo 3 launched on September 25, 2007, meaning the Bungie-developed shooter has now celebrated its 10th anniversary. That probably makes you feel old.

To celebrate the occasion, Microsoft is launching a limited-time playlist in Halo 5: Guardians. The Halo 3 Classic Throwback playlist features Halo 3 maps remade with Halo 5's Forge tools, including some of the best ones: Guardian, Boundless (Snowbound), The Pit, Citadel, Isolation, High Ground, and Ghost Town.