Challenge mods?

Hey guys.

I was wondering what were some good challenge mods that are out there. I've played a couple, but I want to record some demos of me playing wads with other challenge mods on as well. I think I remember something called "Satanic" or something which was pretty good, but I want more.
Thanks.

I take it you have already played the Hell Revealed series, Alien Vendetta, Kama Sutra, Scythe series and Deus Vult series, so you could try playing some of these:

• Death Destiny's WADs
  
• JK's Holy Hell
  
• Insane_Gazebo's Sunder [direct link]
  
• ArmouredBlood's Something Gothic
  
• TimeOfDeath's Time Of Maps - Part 1
  
• Phml's Phmlspd [direct link]
  

I meant gameplay mods. I've played all of those you mentioned too.

Have you tried cyberdreams? Its pretty challenging and you have to ACTUALLY use your BRAIN check it out if you already haven't.

Don's Challenge is a really good EDGE gameplay one, but good luck finding it, it's pretty much impossible to find. :(

Are you talking about engine mods, wads that modify the behavior of the game to make it more challenging? Or are you asking about wads with harder levels, etc?

mods that change the behavior of the game itself.