Difficulty Chart

Class -∞

 * The First Difficulty

Class -4

 * The Alphabet Chain (Class Negative)

Class -3

 * Hyper Reborn The First Difficulty
 * Overflowed Impossible
 * Heavenly Unimpossible

Class -2

 * Unrebirth N/A
 * Unrebirth Unimpossible
 * Unrebirth True Easy
 * Unrebirth A
 * Unrebirth Disco-Infite-Easy
 * Unrebirth Infite-Easy
 * Unrebirth Felix The ДA
 * Unrebirth Exist
 * Unrebirth Relax
 * Unrebirth Win
 * Unrebirth Do Nothing
 * Unrebirth Just Air
 * Unrebirth Unlosable
 * Unrebirth Automatic

Class -1 (Instant Win / Unfailable)

 * N/A / Not Availbale
 * UnJumpless
 * Unimpossible
 * Almost Unimpossible
 * Unpossible
 * Friendly Possible
 * UnPress A Key
 * Ifinite-Ifinite-Easy-Ifinite-Easy-Alpha-Easy-Null-Ifinite
 * Ifinite-Dot
 * UnJoyful
 * True Ease
 * A
 * UnAutomatic
 * Ifinite-ifinite-ifinite
 * Disco-Infite-Easy
 * Ifinite-Easy
 * UnUnmissable
 * Felix The ДA
 * Exist
 * Relax
 * Skip
 * Shortcut
 * UnJust Air
 * Instant Win
 * UnDo Nothing
 * UnWin

Class 0.0 (Do Nothing)

 * Win
 * Wait 0.0001 milliseconds to win
 * Do Nothing
 * Rising
 * Just Air 2.0
 * Just Air
 * Wait A Second
 * Wait A Second Sub Difficulties
 * Unlosable
 * Roll
 * Fall 0.00001 studs to winpad
 * Mazeophobia
 * Safe
 * Unmissable
 * Contraption
 * Shattered Babass
 * Automatic
 * Spherical

Class 0.4 (Press or Hold a Key)

 * Press Any Key
 * Joyful
 * Do Something
 * Patrick
 * Press a Key
 * Tap a Key
 * Hold a Key
 * Press a Key and Space a Bar
 * Climb a Ladder
 * Climb a Truss
 * Climb a Small Truss
 * Climb a Very Small Truss
 * Walk a Slope
 * Slope a Button
 * Climb a Slope
 * Go Down A Slope
 * Fall Into A Hole From The Top of The Tower 
 * Do A Ten Stud Tightrope
 * Get A Key To Open A Door

Class 0.7 (More than holding)

 * Click Once
 * Click Once Sub Difficulties
 * Go Around A Hole
 * Jumpless
 * Bot
 * Amazing
 * Cakewalk
 * Unwalkable
 * Adorable
 * Atraxy
 * Sweet
 * Sugary
 * Jump Once
 * Jump Once Sub Difficulties
 * Lovely
 * Failable
 * Brilliant
 * Reflectanceable
 * Piece o' Cake
 * Slice o' Cake
 * Enthusiastic
 * Helpful
 * Pleasant

Class 1.0 (Baby)

 * TooTooEasy
 * TooEasy
 * Peaceful
 * Satisfying
 * Babying
 * UnRebirth MegaDeath
 * Magnificent
 * Effortlesslesslessless
 * Effortlesslessless
 * Effortlessless
 * Gravel
 * Mature
 * Newbie
 * Painless
 * Facile
 * Neat (Old)
 * Effortless
 * Playground
 * Simple
 * Easy (FE2)

Class 1.2 (Low True Normal)

 * Easy
 * Neat
 * Nice
 * Calm
 * Normal (FE2)
 * Thining
 * Lovely
 * Mortal
 * Gar-Effortlessless
 * Medium
 * Normal
 * Hard (FE2)
 * Standard
 * Moderate
 * Mediocre
 * Gar-Effortless
 * Hard
 * Harder
 * Unhappy
 * Tricky

Class 1.4 (Mid True Normal)

 * Difficult
 * Skilled
 * Insane (FE2)
 * Even Harder
 * Gar-Easy
 * Challenging
 * Gruelling
 * Irritating
 * Demanding
 * Lunatic

Class 1.6 (High True Normal)

 * Intense
 * Frustrating
 * Unforgiving
 * Intension
 * Intensium
 * Punishing
 * Gar-Medium
 * Remorselessless
 * Remorseless
 * True Skill
 * Infuriating
 * Unfortunate
 * C0RrUpT
 * Destruction
 * Relentless
 * BORDERLINE SOUL CRUSHING

Class 1.8 (Soul Crushing)

 * Crazy (FE2)
 * Ghostly
 * Insane
 * Crazy+ (FE2)
 * Madness
 * Savage
 * Glitching and Healing
 * Gar-Hard
 * Extreme
 * Painful
 * Uneasy
 * Absurd
 * Terrifying
 * Ghastly
 * Horrifying
 * Inception
 * Catastrophic
 * Generation Failure
 * Cruel Punishment
 * Gar-Difficult

Class 1.9 (Mental Blowing)

 * Horrific
 * Strange
 * Quirky
 * Hideous
 * Unreal
 * Treacherous
 * Beanos
 * HYPER
 * Hyper Sub Difficulties
 * nil
 * HEART OF VOID
 * Psuedo

Class 2.0 (GodPlayers Be Like)

 * eRRoR
 * Yin&Yang
 * Double eRRoR
 * Triple eRRoR
 * TooHard
 * THE BORDERLINE
 * BORDERLINE IMPOSSIBLE
 * WayTooHard
 * Maximum Overdrive

Class 2.1 (TAS Only)

 * No
 * Death
 * True Hyper
 * True Jumpless
 * Broken Spacebar
 * DEATH+
 * Death Bullet Hell
 * NULLIFYING
 * Nifihelm
 * HELL
 * HECK
 * TARTARUS
 * TARTARUS Core
 * TARTARUS Core Half A
 * TARTARUS Core Half B
 * Calamity
 * UNIMAGINABLE
 * Disbelief
 * Dimension
 * Pi
 * Pie
 * OMEGA
 * Omega Sub Difficulties
 * Suffer

Class 2.5 (TAS Impossiblity)

 * Aleph-Null
 * Reality
 * Greek Alphabet Difficulties 
 * Immeasurable
 * Incomprehensible
 * Malicious
 * Malicious-Zeta
 * Autism
 * Destructive
 * ᴇʟᴅʀɪᴛᴄʜ
 * Aleph-One
 * Limbo

Class 2.9 (The Willing To Impossible)

 * Monsterous
 * Diabolicial
 * Ultimate
 * System Error
 * Simply Beyond
 * DIE
 * WHY YOU NO DIE
 * Fatal Error
 * U DEAD SON
 * REEEE...!!!
 * Nonexistent
 * D-I-E
 * Aleph-Two

Class 3.0 (Physical Impossibility)

 * Supreme
 * UNTHINKABLE
 * Oblivion
 * Quantum
 * Oblivion
 * DELETE
 * Yxle
 * Aleph-Three
 * Subatomic
 * ULTRA INSTINCT
 * SupreXD
 * Hypreme
 * El Vacio (OG)
 * Mortifying
 * PooPoo. Toilet Paper.Exe
 * Aleph-Cow
 * MidTier Number Chain
 * Doomsday
 * Transfinite
 * Rebirth N/A
 * Rebirth Unimpossible
 * Rebirth Infite-Infite-Easy-Infite-Easy-Alpha-Easy-Null-Infite
 * Rebirth Unimpossible
 * Rebirth Infite-Infite-Easy-Infite-Easy-Alpha-Easy-Null-Infite

Class 3.5 (Theoretical Impossibility)

 * RoarXD
 * RawrX3
 * MegaX3
 * Rebirth Infite-Easy
 * RoorHELL
 * Rebirth True Ease
 * haha life go brr
 * Obama Prism
 * Error Difficulties / The Error Chain (OG)
 * nCr / nPr
 * Dreadful.exe
 * Aleph-Null Sub Difficulties (Aleph-Four to Aleph-Googolplexian)
 * Jesus Ballin
 * Nullified Acrimony
 * TACO
 * TACO

Class 4.0

 * El Vacio
 * Infinite Crashing
 * Y E E T U S
 * Universe Disruption
 * Hyperwave
 * Aleph-Aleph-Null
 * 60mmm
 * Spongebob
 * TRUE EL VACIO
 * Malicatious
 * Error Difficulties / The Error Chain
 * MEGADEATH
 * MEGADEATH Sub Difficulties
 * Void
 * Void Sub Difficulties
 * Impossible
 * Universally Impossible
 * Multiversally Impossible
 * Aleph-Aleph-One
 * Not Anymore
 * Physically Impossible
 * Just Buildable
 * Maybe Unbuildable
 * Maybe Buildable
 * Aleph-Aleph-Two
 * This difficulty does not exist.
 * Nothing
 * Pink Death
 * Pink Death

Class 4.5

 * DILLY IMPOSSIBLE
 * X
 * Y
 * Z
 * bruh
 * GRU
 * MINIONS
 * Raining Tacos
 * We Like Pizza
 * Aleph-Something
 * Ew Gross
 * ξπψ
 * Epil
 * Vapidimemonomepi
 * Graham's Number
 * Rayo's Number
 * 0.01 Sensitivity
 * 1e+69 Sensitivity
 * Ω
 * +Ω+ / -Ω-
 * xΩx / ×Ω× / ÷Ω÷
 * A B S O L U T E / True Absolute
 * Minus Absolute
 * Infinite Impossible / Unbeatable
 * ψ
 * Say Goodbye
 * CRASH
 * Rebirth Effortlessless
 * Rebirth Effortless
 * Rebirth Easy
 * Vector
 * BarrelPlexian
 * Flexian
 * BEYONDDEATH
 * Black Death
 * BlackPink Death
 * 9¾
 * 9¾

Class 5.0

 * Eat Grass
 * TooRNG
 * OMEGADEATH
 * Alt+F4
 * ALPHADEATH
 * 8=D / 8==========D
 * D
 * ax+by=c
 * A²+B²=C²
 * Aleph-Die
 * True Obama Prism
 * Rebirth Medium
 * El Octa Vacio
 * El Guy Vacio
 * Supreme-Null
 * Aleph-Omega
 * Omega-Aleph
 * Omega-Omega
 * Replay
 * Microsoft / Microsoft Difficulty
 * Eternal Death
 * Amongus / Amongas
 * THOMAS THE TRAIN
 * Rebirth Hard
 * OmG PiNKLeAf BEaT t0H hE BeSt GaMEr
 * Aleph-II
 * aleph-TS
 * Obamium Ballin
 * ε0₂
 * Hard times 1e(e times infinity)1
 * ε0₂
 * Hard times 1e(e times infinity)1
 * Hard times 1e(e times infinity)1

Class 5.49

 * The Entire Alphabet

Class 5.5

 * The Entire Reversed Alphabet

Class 5.51

 * ε0 / ε1
 * Ew / Nah
 * WHY WOULD YOU DO THIS
 * Dead Brain Cells
 * Xploshi
 * Whatever
 * Aleph
 * Rebirth Difficult
 * msituA
 * VORTEX
 * SUS / You're Sus
 * agemO
 * OCTADEATH
 * ROOI
 * Five-Star / ★★★★★
 * RoorOmega
 * Rebirth Challenging
 * Six-Star / ★★★★★★
 * Alt-F4
 * Rebirth Challenging
 * Seven-Star / ★★★★★★★
 * The Entire Greek Alphabet
 * The Entire Reversed Greek Alphabet
 * TooDry
 * Malicious-Lambda
 * MacNCheese
 * 2hard4u
 * Rebirth Intense
 * Baby Shark du du du dudu
 * Do The Funny
 * bobux
 * ε0₃

Class 6.0

 * Felix The βB
 * R
 * JUST LEAVE
 * DELETED UNIVERSE
 * WHAT THE HECK ARE YOU DOING GET OFF BEFORE YOU DIE!!!
 * Rebirth Intense
 * We Like Pista
 * Bird
 * Busted
 * MLG DOGE
 * Nothing. No obstacles.
 * CURSED TEXT
 * Not Cursed Text
 * Tom / Jerry
 * X
 * Y
 * Z
 * Nifihelm
 * Undodgeable
 * POG
 * cat
 * dog
 * ε0₄
 * Freedom Dive / Freedom D↓ve
 * Broken Physics
 * Broken YEETUS
 * Rebirth Remorseless
 * Something harder than you think
 * Brain melting
 * It's just all dream
 * B
 * EasyysaE
 * a=a+1 confirmed
 * 1=0
 * Cannot press W
 * Cannot Press Sub Difficulties
 * Aleph-Greek Alphabet Difficulties
 * Cannot press W
 * Cannot Press Sub Difficulties
 * Aleph-Greek Alphabet Difficulties
 * Aleph-Greek Alphabet Difficulties

The rebirth chain

 * Rebirth Insane
 * Rebirth Inxtreme
 * Rebirth Extreme
 * Rebirth Extrfying
 * Rebirth Terrifying
 * Rebirth Terristrophic
 * Rebirth Catastrophic
 * Rebirth Catarrific
 * Rebirth Horrific
 * Rebirth Horrinreal
 * Rebirth Unreal
 * Rebirth Unnil
 * Rebirth Nil
 * Rebirth NHY
 * Rebirth WHY

The Coil Chain

 * Gravity Coil
 * Gravity Coil.exe
 * True Gravity Coil
 * True Gravity Coil.exe
 * Speed Coil
 * Speed Coil.exe
 * True Speed Coil
 * True Speed Coil.exe
 * Heal Coil
 * Heal Coil.exe
 * True Heal Coil
 * True Heal Coil.exe
 * Fusion Coil
 * Fusion Coil.exe
 * True Fusion Coil
 * True Fusion Coil.exe
 * Hyper Coil
 * True Hyper Coil
 * Ultimate Coil
 * True Ultimate Coil
 * Mother of All Coils

Class 7.3

 * The Devils Playground
 * THE MATRIXBREAKER
 * THE DEVILS CORE
 * THE CORE OF ALL

Class 7.7

 * THE GRAND GREAT CRAZY AMAZING FINAL FINALE

Class 7.99

 * The Final Difficulty

Class 8 (Over-Finale)

 * stop-
 * stop-

Class 12 (Peak Human Imaginablity)
== Class 13 (Low Unimaginable) ==

Class 15 (High Unimaginable)
You cannot even imagine this class' difficulties' name.