TerraTD, a Tower-Defense Construction Kit

Field notes

The interface combines a tower-defense board with a compact map editor: users can define walls, floors, lanes, spawn points, and endpoints before running waves and placing towers. Maps support resizing, save/load, import, and export, while the Level Creator and Playlist tools extend the format beyond a single match. A daily challenge gives all players the same map and places results on a scoreboard; random maps are explicitly labeled practice-only and unscored.