Xen Attacks!

Loke

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Xen Attacks is a bonus mission to the Decay mode on the Half-Life Playstation 2 version. The story is simple, you control two Alien Vortiguants named X-8973 and R-4913 which is sent out by Nihilanth to recover a crystal. That's all basically, it's a short but pretty fun mission.

There is one cheat code in the PS2 version that hasn’t been found yet until now (AFAIK). Hoaxer, the creator behind the porting of Decay on the PC, looked through the interface scripts on the PS2 version and found a cheat there which haven't been noticed and hasn’t been posted on any website like GameFAQs or Cheatplanet. What it does is basically unlocking all of the Decay missions including the Xen Attacks bonus mission.
For those lazy people, like me, which don't want to get an A-grade on every Decay mission can now unlock it with ease.

To unlock it, you need to have two Dual Shock 2 controllers plugged into your Playstation 2.
After you've done this, do the following; go into the cheat menu were you can input various cheat codes, now type this into the field:

p2_R3, p1_L3, p1_up, p1_up, p2_down, p2_down, p1_left, p1_right, p2_left, p2_right, p1_X, p1_O, START

(p1 means player 1 controller 1, p2 means player 2 controller 2, you must enter the code exactly as it describes)

If you entered the code correctly, you should see "Decay Unlocked" appear at the screen, like this:
xenattack6.jpg


Go into the Decay menu and all the way to the left, the mission should now be unlocked and ready to be played. Enjoy. :)

xenattack4.jpg


For those who’s not got the PS2 version or not even a PS2 itself, don’t be afraid. I took some screens if you always wanted to see how it looked like.

xenattack.jpg


xenattack2.jpg


xenattack3.jpg


xenattack5.jpg


xenattack7.jpg


xenattack8.jpg
 
You don't really need to get A on every mission. Just the last one.

At least that's what happened with my copy. I unlocked XA and I'm sure I got one less A mission.
Maybe it's just an A for one character per mission.

Regardless, for those not in "the know", the bottom line on the HUD is health and that fourth gameplay screen shows the crosshair when the lightning attack is fully charged.
You regain health by damaging things.
 
Mechagodzilla said:
You don't really need to get A on every mission. Just the last one.

This is basically what GameFAQ's have to say:
Get an A-grade on all 9 of the Decay missions. If you successfully do this, you'll get to play a 10th level as a Vortigaunt alien. Getting an A-grade on this level will formally unlock the Alien Mode. (Note: the best way to ensure an A-grade for a level is to get at least 25 kills.)

I haven’t tried it though, perhaps you're right.
 
Nice Loke! Don't you have some more detailed picture of this crystal from end of mission?
 
Polaris said:
Don't you have some more detailed picture of this crystal from end of mission?

I can try taking a better picture, the only problem is that when you approach the truck, which has the crystals, the mission ends.
 
It only ends if you go near the back. Go around the side and you can get some good views of the side and front parts of the truck.
 
Mechagodzilla said:
Regardless, for those not in "the know", the bottom line on the HUD is health and that fourth gameplay screen shows the crosshair when the lightning attack is fully charged.
You regain health by damaging things.
AvP rip-off. At least on the hud bit and the health bit :p
 
Also using the "Alien Mode" cheat you can play through the normal HL game. If you do the ending is different.

After you take the teleport to the Nihilanth's chamber instead of appearing there you go to an area with a circle of vortigaunts surrounding you who 'worship' you.
 
Okay, I took a bunch of pictures although the majority was crap. I needed to restart (curse Gearbox for not adding a quick save to Decay) the mission several times because I couldn't get into the back of the truck without getting stuck. I did it on the last try though, but it’s hard to grab some pictures with the keyboard while you hold the other hand with the controller. But I hope its good enough.

Anyway...

xencrystal.jpg
 
Thank you very much Loke. Interesting picture for mineral maniac :)
 
"the creator behind the porting of Decay on the PC"
Link? Unless it's that HL2 mod that's still in development.
 
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