Men & Magic established the foundation for Dungeons & Dragons, introducing three classes, classic races, and the six ability scores. It utilized a Law-Neutral-Chaos alignment and offered an alternative combat system that became the modern standard for the game.

Chainmail established the foundations of D&D, introducing fantasy combat, alignment, and early magic systems. It moved from mass warfare to individual skirmishes. While lacking modern hit points, its monster lists and spells shaped the future of RPGs.