The 10 Best-Selling Video Games of All Time

Games have always existed in a numbers-obsessed industry. Sega vs. Nintendo defined a generation in the '90s, while today's comparatively mild console wars and monthly NPD reports keep sales figures near the forefront of games-related discussion. New monetization models require new metrics for success — monthly active users, player retention rates, in-game revenue, etc. — but one of the industry's biggest questions remains: What are the best-selling video games of all time?