Gemcraft is a popular tower defense game series where players use magical gems to create powerful towers and defeat waves of enemies. The game combines strategy and resource management, allowing players to craft and upgrade gems to enhance their defenses. In Gemcraft, players can explore various maps and levels, each presenting unique challenges and enemy types. The game features a rich progression system, where players earn experience and unlock new abilities, making it engaging for both casual and dedicated gamers. The series is known for its depth and complexity, appealing to fans of the genre.