Necrotyper is a typing-based action-adventure game with elements of RPG and strategy. The player controls an undead army indirectly by typing spells to support it. There is no direct unit control; gameplay focuses on typing to influence battles.

Typing speed is important to avoid being overwhelmed by enemies, but accuracy also plays a role—mistake-free typing increases spell effectiveness. Spells can be upgraded over time to help manage the increasing number of enemies.