Uhh..

6 Single Player (taking into account the early sp levels i uploaded under the wrong gametype)
3 Multiple (including the pack I made with FS)
13 CTF
4 Battle
3 Custom/Concept
2 Race
1 tileset (the tileset compilation for my first SP pack)


CTF I guess, because its fairly easy and quick to make compared to SP packs and custom concept levels.