Realm Grinder is an incremental game where players manage a kingdom by choosing a faction and upgrading their resources. Players can select from various factions, such as Fairies or Undead, each offering unique abilities and bonuses to enhance gameplay. As players progress, they unlock new buildings, spells, and upgrades, allowing them to generate more resources over time. The game features a prestige system, enabling players to reset their progress for permanent bonuses, encouraging strategic planning and exploration of different playstyles.