Author Ronen Basch
Original mod release September 27, 2000
Date of release March 23, 2020
Sven Co-op Conversion Xada
Last update v104
.bsp filename (merged version) zubben_intro, zubben_1, zubben_2
.bsp filename (original) zubben-zubben7


You probably have guessed it already, but the U.S.S. Arizona is not a research vessel and these are not scientists on-board. Whatever the research team on ZUBBEN discovered, the earth government is going to do everything in its power to keep anyone else from knowing about it, even if it means killing everyone.
You are Gordon Freeman JR., A research assistant and a junior administrator on the ZUBBEN ground base. You give the orders to wake you up as soon as the U.S.S. Arizona enters ZUBBEN's atmosphere and then you step into the cryo chamber, not knowing that this is going to be your last peaceful sleep for a very VERY long time.
Objective: After the Arizona lands and all hell breaks loose, try to get to the communication tower which is located outside of the base perimeter. The transmitters on top of the tower should give you enough juice to call for the science ship currently orbiting ZUBBEN.

Additional info (Xada's original conversion)

This is an old HL1SP campaign I ported to Sven using RIPENT mostly. I added some new additions to highlight the Sci-Fi theme and rebalanced it around Sven mechanics otherwise it was ridiculously easy in co-op. If anything is broken please let me know and I will repack the maps accordingly.
These maps are also centered and balanced from survival and it is supported even if not -technically- implemented.
May add this in CFG later depending on feedback, though I did not want to force it on anyone and it is easy enough to enable yourself on servers.

Additional info (Garompa's merged version)

This is my take on expanding from Xada's port. Maps have been merged into 2 maps, and an extra intro map was added on this unique special case for a special singular purpose. There are a lot of additions, some call it an "expanded universe" (references, community members, even Richard Boderman).
It is supposed to be the first maps to be played during a long campaign spanning all ported maps (and future ports), ripents and already existing maps from the community from the very start of Sven Co-op (a personal project to be disclosed one day that is basically a glorified mapcycle).
It has heavy lore, telling the beginning of a story, with some 4th wall breaking, ingame mechanics explanations, and really bad voice acting.

Of course this should be taken as a TUTORIAL LEVEL for anyone that starts playing Sven Co-op… and thus, there are options to skip the intro map, and the tutorials (play them once at least, there are references to everything here).
I have left out mechanics from the tutorial such as climbing on top of other players which is not needed here, or ledge grabbing/autoclimbing. Also expect a lot of bug fixing, more weapons, ammo, npcs, events, etc…
I hope this is an enjoyable experience for everyone and merry christmas!

Additional credits

  • Port to Sven by Xada (credits.txt inside with specific additional content credits)
  • Garompa for the expanded and merged version based on Xada's port
  • Midnight Cityscape (environment map for Quake2, Half-life and Sin) by Murray Christian (contact: ten.ii|noixulf#ten.ii|noixulf)
  • Chinatown unfinished mod (for Zubben Intro) by Steve Cook
  • Arctic labs unfinished piece (for Zubben Intro) by Issues Team: Indigo, Kol, Manoid, Mr.Ben, Scourge, SEThorian, Firebinder, Hugh, CampaignJunkie, ArbronI


Garompa's edit & merge:

Xada's original port:


2000 2020 community-edit conversion difficulty:medium series size:large walkthrough

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