Description:
Complex doom" is one of the most ambitious mods to the first two parts of the game "Doom". The mod was created by the player under the nickname Daedalus.
The main feature of the mod is a casual spawn of enemies. For each monster from the original game, there are several different variations, and each time the level is restarted (except for downloading the save), the set of monsters is generated anew. For example, a zombie with a shotgun can be replaced by a zombie with a double-barrel or a zombie with an automatic shotgun. Also mod adds a lot of new weapons, replaces the old one, some barrels recharge. And, at last, an inventory system with expendable items (portable first-aid kits, armor sets, bags with cartridges, etc.), which can fall out of killed enemies with some chance, is introduced.

LSD - Legendary Complex Add-on, RandomMonsters and HEM), Dusted's addon, add-ons for the "Complex Doom" mod that add new variations of monsters, new weapons, and, most importantly, the legendary versions of all monsters , legendary weapons and legendary items (armor, health, ultrasphere, sphere of cartridges, etc.).

Legendary enemies at times stronger than any ordinary monsters and immune to the damage of the legendary weapon. Each legendary monster has its own unique musical composition that begins to sound for all players if the monster was alarmed.

Features Repack
Picture and sound:
The decal expiration time is increased to 20 minutes. (optionally you can return the default time to 5 seconds, the file is "decals-origin (5sec) .pk3").
The corpses of the monsters no longer disappear.
The music of the legendary monsters has been changed or replaced by a file with better quality (also epic, but other compositions with a higher bitrate, optionally you can return the original tracks - the file "lsd-music-v2 (Origin) .pk3"), music melodies to some new monsters.
The standard (midi) music on the cards is replaced with a better one (actual only for the standard Doom1; Doom2, in order to disable it, delete the "doommus.wad" file in the "Object" field).
Hd textures - zdoom-dhtp-20171001.
Maps of light for Hd textures, if you use standard textures, you can optionally put the original file - "Brightmaps (low texture) .pk3"
Added a flashlight - setup through the main menu "Options => Flashlight options" (only for Zandronum, in GZdoom there are no separate settings)
Improved inventory - to call it, see the item in "options => customize control => Simplex doom Hotkeys => toggle inventory" (only for Zandronum, in Gzdoom the window can be called, but you can not select objects and weapons through it) (weapons from Dusted's addon unfortunately in this menu will not be visible.)
Added support for Gzdoom.
Added HpBar settings "Mod Stuff => HpBar options"

PS
Additional files in the folder - "Optional" to activate them, you need to copy the files to the root folder with the game where "exe" is located and prescribe them in the launch label - in the "Object "at the end of the line.

Gameplay:
Added two new complications. "Hardcore" - the chance of spawning monsters is the same for all types. "Sensless Hardcore" - the chance of spawning monsters is the same for all types, all enemies are fast, the damage from monster attacks is increased by 50%.
In addition to the gun at the start of the player receives a shotgun ("Combat shotgun")
By default at the beginning of the level does not appear a backpack with supplies, you can turn on the menu - "Mod Stuff"
By default, the player is dealt damage with his weapon. You can disable the menu - "Mod Stuff".
The item "Ammopack" (a black backpack falls from almost all zombies) now restores only standard ammunition (bullets, shot, rockets, plasma, grenade, mine). Legendary ammunition to the corresponding trunks can be obtained from the legendary monsters and a bit from ordinary backpacks. Drop "Backpack" from monsters is greatly reduced. (To pass the entire game exclusively with the Leg trunk will no longer work).
Item - "LegendaryAmmoSphere" no longer restores ammo to maximum, only temporarily turns on endless shooting without the use of cartridges.
Weapon drop from monsters is reduced approximately 3 times, except for the Cybers and Masterminds. You can include 100% drop in the menu - "Mod Stuff" (because rare types of enemies began to appear more often, with a standard drop of cannons too quickly you can get the imba trunks).
By default, the items (runes) that gave permanent effects are disabled (except for "Drain rune"), you can turn on the menu - "Mod Stuff".
Most special bonuses that give temporary effects no longer stack (only 1 piece can be in inventory, but there are a few exceptions).
All legendary monsters (who had such a chip) were invulnerable in some attacks, but added + 50% to HP, except for the various CyberDemons, they had the HP at the same level practically (To put any harm to the Legendary Cardinal for example it was extremely difficult , all damage was blocked by an impenetrable shield).
Not all the monsters from the add-on "HEM" have been added to the "Spawn List". Many of them, especially bosses, are designed for a cooperative regime.
Part of especially powerful enemies are weakened (Overlord; Abyssalsatyr; FreezedCyberDemon, etc.). Most of the enemies, who had such a chip, removed the impenetrable shields and restore health.
"Legendary Cardinal" no longer calls for helpers (both in usual and in "True" form).
TrueLegendarySentient moves now is not so chaotic and there is no portal for summoning Legs.
Weak enemies appear less often, stronger ones more often (in comparison with the original, of course, weaker opponents on the average are more powerful, the complexity of "Hardcore" equalizes the chances).
A timer has been added for each temporary bonus. Some spheres can activate several effects, correspondingly several icons will appear.
Chance drop from the monsters "Demonic Energy" reduced by 2 times, but there are more enemies with whom it can fall.
Monsters of the same type, except for rare exceptions, no longer attack each other.
Different essences from monsters (give a small increase in armor and health) no longer disappear after a while.
Added turrets to loot to some monsters.
Part of the weapon was removed from the loot (Enforcer, Autogun, Plasma rifle, etc.) mechanics is practically no different, only cluttering the inventory. More than enough trunks.
Weapons: The damage of fragmentation grenades, ice grenades and ice mines has been reduced by 50%. Grenades and mines in slot "0" instead of "1".
Weapons: "PyroCannon" No longer inflicts damage to legendary monsters (killing all with 1 shot, except for Kibers), homing is no more.
Weapons: "Legendary Railgun" Damage reduced to 1500 on average (before that, knocked out about 5,000 damage per shot - the standard Cyberdemon was dying at once).
Weapons: "Legendary Light Machine Gun" Damage reduced by 50%.
Weapon: "St Railgun" Damage increased by 50% (Rails with 4 charges).
Weapons: Demon Tech Rifle Damage reduced by 25%.
Weapons: "Fantasy Staff" Primary attack damage has been increased by 50%, the damage of an additional attack has been increased by 2 times.
Weapons: OccultSpellbook An alternative attack uses 30% less energy.
Weapons: "Demon Tech Shotgun" For any attack uses 2 times more energy.
Weapon: "Blackhole Generator" Uses 300 units per shot instead of 150.
Weapon: "Demon Tech Railgun" Uses 15 energy instead of 10.
Barrels: Legendary barrels no longer spawn. Damage and damage radius of conventional barrels are increased approximately 2 times. In addition to the usual can appear "Oilbarrel" - after the explosion ignites the space around itself.
Added several new monsters: (DemolisherMKII; HellsMinister; NightmareCacodemon; ToxicRevenant; CerebralBehemoth; CorruptedGeneral; FlyingCerebralImp). These monsters are from the addon "Clusterfuck".
Ice attacks no longer freeze corpses of monsters.

PS This is my personal build, the balance of the originals is different, you do not need the authors of mods to spam questions about the gameplay if you play it.

System Requirements:
• Operating system: Windows® XP / Windows® Vista / Windows® 7 / Windows® 8 / Windows® 8.1 / Windows® 10
• Processor: x86 / x64 with a frequency of 1 Ghz or more.
• RAM: 128 MB or more.
• Video: 64 MB of video memory and Shader Model 1.0 / 2.0 / 3.0
• Sound card: Sound card compatible with DirectX
• Free space on hard disk: 2 GB or more.

Installation instructions:
Run Setup.exe
Start the game via the shortcut on the Desktop or from the Start menu.