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Arctic Defense Expanded (NPC Defense Map)

This is a reimagining, almost completely from the ground up, of the Garry's Mod workshop version of Arctic Defense gm_arcticdefense. The map is larger, there are more enemy types, new friendly NPCs to fight alongside, and the lighting quality has increased.

To be able to encounter Hunters, please make sure you have Half-Life 2: Episode 2 mounted in Garry's Mod

Here's a list of what's new:

• Time based difficulty has been extended past 15 minutes
  
• After 15 minutes, Combine Elite will replace some Combine Soldiers
  
• You can now choose your starting difficulty, from values 1-16, with 1 being the field after 5 minutes have passed, 15 being the field after over an hour has passed, and 16 being a sort of "Nightmare" difficulty
  
• There are now Striders which will break the windows of the ship's bridge and make a beeline for Odessa
  
• Every 5 minutes, the amount of Vortigaunts you have will increase, up to 16. At the same time, the amount of Hunters will increase too, up to 16 as well.
  
• After about 7 minutes into the conflict, a friendly rebel driven helicopter will join you to distract enemies and deal some damage
  
• After about 9 minutes have passed, a Combine Gunship will spawn and attack the crew of the Borealis.
  
• Rebels with RPGs may now spawn from the teleporter. They should hopefully assist in killing Striders and taking down Gunships.
  
• The map is far larger; Combine now come from a distance instead of spawning directly in front of the ship

I felt that gm_arcticdefense in its current state provides a different experience from all the goals I had set for it, so in an attempt to not ruin something some may deem good, I have made this now even more hectic NPC fight fest its own map. My biggest regret with the original Garry's Mod Arctic Defense was the addition of Dropships, since they could be quite buggy; my second biggest regret was removing them, because they added a little extra to the map, despite their flaws. I did not want something similar to happen again, so these big changes became their own map.

More calmly: The proper troubleshooting steps if you experience an issue with NPCs on this map is to first disable all other addons (yes, all! some weapon addons have Lua code that can break NPCs!) If disabling all other addons fixes the issue, then you may then re-enable all addons and disable any you think may be causing the issue. If you have no hunch at all as to what addon could be causing the issue, then re-enable your addons one-by-one. I cannot be responsible for what other people make and what you subscribe to, so please keep that in mind. It should take you less than two minutes to press the "Disable all addons" button then re-enable this addon, then test.

If disabling all other addons doesn't fix the issue, then you may leave a comment, and specify if you were playing singleplayer or multiplayer (playing by yourself with a max player limit greater than 1 is playing multiplayer!)

If any of that seems harsh, please understand that reports of maps not working with issues I cannot reproduce are far too common, and I can only leave other addons as suspect.