This mod brings two difficulties from the vanilla game.

Mayhem

Basically OVERKILL difficulty with increased unit health and spawn rates like on Death Wish. So, they don't shred you instantly, but they cause a ammo shortage in the team and an outnumbered amount of SWAT won't let you rest compared to OVK. Great compromise if you're bored of OVERKILL, but Death Wish is too hard for you.

Death Sentence

Pure DS from the vanilla ported almost untouchable with some exceptions.

• Recons and Reenforcers groups will spawn, so Zeals will appear before even the assault gets started
• Dozer headshot multiplier is x34,375 instead of x7,5.
  Note: that change was made because dozers are a nightmare even in OVK on classic balance, and now imagine that they are running, unstunnable and you could spend all your amr-16 ammo just to kill a single dozer.
• Doesn't have Medics, Medic Dozers and Minigun Dozers in the spawn pool.

DS on Update 37 is much harder than the vanilla version. Classic balance doesn't have perk decks, overpowered weapons and skills, AI tick rate has no lock which makes units go crazy on high fps. Still it doesn't mean that it's unbeatable, it is definitely doable. But are you ready for this challenge? I think you aren't.

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Installation:

1. Extract Mayhem & Death Sentence for U37.1 folder into mods folder.
2. Extract files from Old zeals or New zeals folders with replasement into the assets folder.
   Done. You are ready to play.

Uninstallation:

1. Simply remove Mayhem & Death Sentence for U37.1 from the mods.
   That's it. Difficulties will be removed. You will still have the content of Zeal units, but they will not be active and will not affect the game at all.

Full uninstallation: (Just in case)

1. Remove Mayhem & Death Sentence for U37.1 from the mods.
2. Remove 50d75c556cde9b5c_h.bundle, 50d75c556cde9b5c.bundle, all_15_h.bundle, all_15.bundle, and bundle_db.blb from the assets folder.
3. Extract file from bundle_db (original).zip archive into the assets folder.

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Special thanks to RedFlame for making possible to add the units, textures and such to the older versions of the game.

This mod most likely works on any version of the game or at least on most of them, but the bundle files are packed only for Update 37. So, if you want DS and Mayhem on any other updates, just ask me. I will pack files for a specific update or maybe replace zeals with blue swat to make it compatible with your favorite update you are playing.