Fixing Bugs

Because your level is a complex system made of different, interlocking subsystems (a combat system meshed with a movement system meshed with a 3D engine, etc.), bugs tend to be harder to fix than find.

Some bugs, like misplaced textures and objects whose placement obstructs the player from something, are pretty easy to fix. Other bugs, like bugs in your scripting or collision problems can be a lot harder to nail down.