Halo 2 expanded the original "combat loop" with several key additions: Halo 2: Anniversary - Late Review
is widely considered one of the greatest first-person shooters of all time. Originally released for the original Xbox and later ported to Windows Vista, the game defined a generation of multiplayer gaming and delivered an iconic sci-fi campaign. However, the official PC port is notorious for its massive file size and demanding system requirements (historically requiring Windows Vista).
Unofficial "highly compressed" files from third-party sites are frequent vectors for malware or bloatware. Better Alternatives