Command & Conquer: Generals - Zero Hour

Regarded as Command & Conquer at its best, with a fantastic, genuinely challenging campaign, well-designed and versatile skirmish maps, aggressive AI, and three richly distinct factions backed by personality-driven generals and a flexible infrastructure system. Its one real flaw is age: the engine crashes and lags once too many units appear because it was never patched for modern hardware. The fan-made Generals Evolution mod is highlighted as a way to play it crash-free with better visuals and sound.