Halo

Halo defined console shooters and catalyzed Xbox’s rise, yet its 90 million total copies sold place it 40% below #9 Resident Evil's 150 million. Halo: Combat Evolved launched the franchise with 5 million units, and Halo 3 alone moved 14.5 million copies, boosting Xbox 360 sales by 200% in its debut quarter—3x faster than the average shooter series' hardware impact. However, its per-game average of 3.5 million units trails Master Chief's own legacy: Halo Infinite sold just 3 million in its first month, a 50% drop from Halo 3’s launch tally. Despite being the 10th-highest-selling franchise, its influence on online multiplayer matchmaking and controller aim assist remains unmatched, though it now lags behind Resident Evil in total revenue generation by $4.2 billion.