Worked for the timespan of over a year and Half all 15 the levels of a new FPS for WiiWare, called Protocol for Sabarasa Entertainment.
This is how I worked on them:
Drawn some sketches on paper in order to note down the basic elements of the maps, item locations, strategic positions, balanced gameplay if a map was to be team based, etc.
Made the basic BSP shapes in order to get the feel for the map and it's surroundings.
Once the map's been tested and approved I moved onto texture application, items, spawn point fine tuning.
After a map was finished, further testing and modification was made until I felt satisfied with it.
The game's been featured at Nintendo Power Magazine and Some levels can be seen in the mag scans (I can't show actual screenshots yet until the game ships!):
I hope you like it.
Also Checkout Sabarasa Entertainment's Website for a brief description of this game: