I will provide levels that I have created here, if you wish to play them, you will need to download the most recent version of ZDoom (2.3.1), I have provided a link for that
HERE. Just click either Win32 (Windows) or Source (Linux / Unix). It will provide you with an zdoom.exe, fmodex.dll, and zdoom.pk3. You will need to provide or find your own version of Doom (12,118kb), DoomII (14,263kb), or Heretic (13,858kb), as they are too big to upload.
All of mine are smaller than that, most because I have had their added graphics and music removed just for that purpose. Some do have extra graphic, music and / or sounds. But those are in another file that is too big. I will provide my first few wads that I have worked on a while back. Granted I was about 10 when I made these, so they may not seem all that... sane.
Twoplay1.wad :: It was made for 2 players (Hence the name of it), but is 1 player compatible.
Storage.wad :: Is a deathmatch wad, there are no monsters.
Ventures.wad :: Is a deathmatch wad as well. No monsters either.
(All are for DoomII)
There is a bot system built into ZDoom, you bring down the console (default key: ~), and type "addbot" it will generate a random bot from it's list. This is how you can test your skills against different skill levels. Different bots have different abilities.