There is a computer in the "Lazarus Labs" level that when interacted with will play a Doom style version of Bejeweled. It can be found in the room with the DOOM Guys crypt on the left side.
Cheat Mode
Press ~ to display the console window, then enter God and press [Enter] to enable cheat mode. This will mark you as a "Cheater" and disable online game play. Enter God again to disable God mode. To play again without the cheater flag, restart the game, then start a new game or load a non-cheat saved game file.
Command Console Cheats
Press ~ to bring up the command console and put the cheats in there.
Code
Effect
Com_showFPS 3
Draw FPS
DebugUnlockPerkByAbility -1
Unlock Perks
DebugUnlockPerkByRequirement -1
Unlock Perks 2
cvarAdd g_inhibitAi 1
Dumb AI
cvarAdd g_permaGodMode 1 ( or type in god)
God Mode
cvarAdd g_permaInfiniteAmmo 1
Infinite Ammo
g_fov X - where X is the FOV number
Change FOV
dev 1
Developer Mode
Demon Deconstruction
As you play through the "Lazarus Labs" mission, make your way to the room with the DOOM Guys crypt. Along the left side, you'll find a cabinet you can interact with to obtain the "Time Well Spent" challenge on the mission. The gameplay resembles Bejeweled.
Dopefish reference
The Dopefish can be found as the logo on boxes of ramen noodles from "Dopechan Noodles" found in various areas.
Fallout series reference
At the start the game in the Prologue where you wake up and leave the area he was kept in, look at the bottom of the security door. You can see that a Mixom Manufacturing sticker has partially slid down, revealing that it was covering a Vault-Tec logo.
Happy birthday room
During the "Titan's Realm" mission, you will encounter an area where you can see a large number of enemies and a yellow booster platform at the back. Walk the stairs to your right and follow the wall along the second floor to the end. There is a hidden room is behind a crack in the wall that you can jump up to reach. Although it looks like it is too small to get through, you can enter the wall.
Skyrim reference
Search near where you first met the Baron of Hell in the Kadingir Sanctum to find a cave with a hidden lever and a skeleton. Notice that the skeleton is wearing a Dovahkiin horned helmet and was shot in the knee with an arrow.
Super Turbo Turkey Puncher 3
During the "A Brighter Tomorrow" mission, get near the location where you find the challenge mission artifact. Search behind fallen debris in this area to find a Super Turbo Turkey Puncher 3 arcade machine. You can hear its retro arcade sounds when you get close to it.
Terminator reference
Jump into lava in the "Foundry" level to sink to your death while giving the thumbs up.
Various Steam Achievements
Follow the indicated steps to earn the corresponding Steam achievement. To view your achievement progress and stats, open the Steam client, select "Community", then search for the game hub for "Doom (2016 PC)". Click the "View Stats" option in the drop down list, then select the option that displays the achievements for your account.
Achievement
How to unlock
A Gift from Beyond
Earn a Rune.
A Toe into Madness
Complete The UAC on Ultra-Nightmare.
An Old Friend
Acquire the BFG.
Argent Fiend
Fully upgrade Health, Armor, and Ammo capacity on a single campaign run.
Argent Overload
Fully upgrade Health, Armor, or Ammo capacity.
Butcher
Perform 200 Glory Kills.
Combat tested, Doomguy approved
Reach Level 5 in Multiplayer.
E1M1
Complete the first mission of the campaign.
Entryway
Complete the SnapMap Basic and Advanced Tutorials.
Every Nook and Cranny
Find all Collectibles.
Historian
Find all Data Logs.
Hot Swapper
Acquire all weapon mods.
IDDQD
Upgrade all Runes.
IDKFA
Earn the Masteries for all weapon mods.
Into the Unknown
Warp to Hell.
IPXSETUP.EXE
Win a Multiplayer match.
Juicin' it up
Kill 150 enemies while using Power Ups.
Knee-Deep in the Dead
Complete the campaign on 'I'm Too Young to Die', 'Hurt Me Plenty', 'Ultra Violence', or 'Nightmare'.
Momentum Shift
Upgrade a Rune.
No Rest for the Living
Play 5 published SnapMaps.
Outnumbered? No Problem
Defeat the Hell Guards.
Overclocked
Fully upgrade all Praetor Suit categories on a single campaign run.
Rip and Tear
Glory Kill all common enemy types in the campaign.