Best slaughter maps?

I want to find a good and challenging slaughter map to play on my free time. Please don't list Plutonia level 32 since I already know about that. 

chillax , my favourite . Make sure you play in uv for best 'top notch' experience .

Otherwise , I would reccommend :

slaughterfest 2012

new gothic movement 2

italo

Check out this thread as well for additional suggestions. 

Well, research and posting links take some time and others already responded, whatever, my suggestions:

- Newgothic Movement 1, 2

- Stardate 20x7

- Toilet of the Gods

- Sunder

- Slaughterfest 2012

- Deus Vult I, II

- Rush

Haven't played most of these ones though, but have some knowledge thanks to videos and streams. As for wads that contain slaughter gameplay in some maps:

- Resurgence

- Valiant

- Ancient Aliens

- Speed of Doom

- Oscillation

- Going Down

- Unholy Realms

Then you have Plutonia 2, Plutonia Revisited and Urania for remakes of Go 2 It.

Oku2v31.wad. It's pretty darn challenging, has a few fights I don't like, but overall I enjoy playing it.

For medium challenge, I recommend eaxt.wad. For "light slaughter", my favorites are Phmlspd and Newgothic Movement 1 (and 2, but 1 was better IMO).

Combat Shock 2 is well worth a play.

Horde's of Chaos X is pretty good if you are into Heretic.

The best slaughter map, imo, is the one you create for yourself. Seasoned to taste, of course.

Feckyoo - map03

Journey to Hell

If you want extremely, then play Veryhard :)