HALO is one FPS that really did introduce many new gameplay elements. It offers all that is said below and the modifications already in development look to refine and improve the "HALO experience" even more!
This is the mission keyes but its been heavily modified to make it look like halo 2 and includes models and sounds as well as weapons from halo 2, just put the map file in your halo custom edition "maps" folder and type in console map_name h2_desertplat, enjoy :D
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