Terrain Grid System 2: A Unity toolkit for creating, editing, and managing large terrains with a grid-based workflow. Build expansive worlds by stitching modular terrain tiles, streaming cells, and LOD-aware chunks to optimize memory and rendering. Includes procedural generation, spline-driven roads and rivers, runtime editing, and paint/height/texture brushes with layer blending. Supports collision, pathfinding integration, multi-terrain stitching, and terrain baking. With performance utilities, editor extensions, and clear documentation, it speeds open-world, simulation, and strategy development while providing precise control over terrain detail and streaming.