Map and cell grid
The engine's spatial floor - the cell array and its indexing, the per-cell height model, map bounds, LandType derivation, and the [Land] movement-cost table. Verified: Tiberian Sun, Red Alert 2, Yuri's Revenge.
World & map
Verified world and map mechanics of the original engine — the cell grid and indexing, floor height, map bounds, LandType, and the movement-cost table.