Here I provide a list of the Sonic games/versions used in my marathons.

For 16:9 marathons, the following games are used, with the mods/settings listed further down.
I try to play the games as "legit" as available even in the 16:9 enhanced versions.
I wish Team Forever would add a Tails Assist disable option for S1F/S2A.

For 4:3 marathons, Sonic Rev1, Sonic CD-J, Sonic 2 Rev0, and Sonic 3 Complete are used, on a MiSTer FPGA.

For splits, I split upon defeat of the last boss of the respective game.
I do not include The Doomsday Zone or any emeralds in my runs, but usually run it anyway at the end.

Sonic 1 Forever
Game requires a Sonic 1 Android APK to play.

Sonic CD (2011) Decompilation
Game requires the 2012 Steam version of Sonic CD or a Sonic CD Android APK to play.
You will also need the latest script files, extracted to the same folder as the decomp.

Sonic 2 Absolute
Game requires a Sonic 2 Android APK to play.

Sonic 3 Angel Island Revisited (A.I.R.)
Game requires a Sonic 3 & Knuckles ROM to play.


--- Sonic 1 Forever Mod Order ---
No Forever Branding
Karl Brueggemann Act Tracks (I use a customized version)
Unique Act Palettes

--- Sonic CD Decomp. Mod Order ---
Partial Act 2 Palettes (by me; didn't fix some zones, would appreciate fix)
Drowning ME (by me; original mod here)
Alternating Soundtracks ME (by me; original mod here)
Sonic CD: Miracle Edition
Shields Plus
MegAmi's Additions
Uncompressed + Corrected SFX (Mirror)
Beta Flowers
CD Cutscenes Remastered (bad ending vocal patch by me)

--- Sonic 2 Absolute Mod Order ---
No S2AMCP Branding (by me)
Anniversary Edition Act 2 Palettes (by me; use S2AMCP version)
Accurate Colored Ending (use S2AMCP version)
Panoramhusky's Special Stage Sprites (use S2AMCP version)
Beta Boss Music for Mecha Sonic
S2A Modding Community Pack
No Absolute Branding
Sonic 2 Sound Effects Restoration

--- Sonic 3 A.I.R. Mod Order ---
Tails in Doomsday Zone
Knuckles & Tails Missing Eggrobo
LeanTM's Tails S3 Style Sprites (labelled as outdated but actually it's up to date enough)
John Tay's Super/Hyper Theme
SpikeSensei's Knux Boss Theme (by me)
Alternate Act 2 Music Mod (I removed Marble Garden and made some fixes; Here's my version)
Sonic 3: The Hybrid Mixes
S3C - Unique Title Card Zone Icons
Misc. Fixes and Tweaks (Mirror)
Sonic 3 Complete Sprites
No A.I.R. Branding


--- Sonic 1 Forever Settings ---
GAMEPLAY
Emeralds: Six
Special Stage Rotation: Original
Random Monitors: Off
Infinite Lives: Off
Time Limit: 10 Minutes
Ground Speed Cap: On
Air Speed Cap: On
Roll Jump Lock: On
Spike Bug: On
ABILITIES
Elemental Shields: Off
Spindash: Off
Insta-Shield: Off
Peelout: Off
Drop Dash: Off
Flight Cancel: Off
Super Cancel: Off
VISUALS
CD Spring Twirl: On
Mania Rotation: On
Shield Type: Sonic 1
Invincibility Type: Sonic 1
Timer: 0'00"00
Region: Miles
Green Hill Water: Forever
Marble UFOs: Off
Sonic Max Dash: CD Peelout
Tails Max Dash: Forever
Knuckles Max Dash: Chaotix
Super Sonic Max Dash: Chaotix
SOUND
Drowning Music: Sonic 1
Super Music: Sonic 2

--- Sonic CD Decomp. Settings ---
Spindash: Original
Drop Dash: Off
Super Peel-Out: On
Insta-Shield: Off
Shield Type: CD
Flight Cancel: Off
Flight Control: S3
Glide Style: MD
Extended Camera: On
Time Limit: On
Time Travel Overhaul: Off
Balance Crouch: Off
Roll-Off Bug: Off
Easy Timeposts: Off
Starting Time: Present
Random Character: Off
Smooth Rotation: On
Peel-Out Sprite: On
Dropping Sprite: On
Mini Jump: Option 2
HUD Layout: CD
HUD Style: CD
Title Colors: RBYG
Title Card Lines: Stage
Stage Labels: Zone
Wacky Assist: On
Tidal Swimming: On
SoundFX Style: CD+
CD Roll SoundFX: On
TTO SoundFX: Restore
Psycho-Egg: Normal
Miracle Form: Off
Soundtrack: JP (but my alternating mod accounts for US also)

--- Sonic 2 Absolute Settings ---
OPTIONS
Ground Speed Cap: Off
Air Speed Cap: On
Roll Jump Lock: On
Spike Bug: Off
Infinite Lives: Off
Time Limit: 10 Minutes
Shield Type: Sonic 2
Elemental Shield: Off
Invincibility Type: Sonic 2
Spindash: Sonic 2
Insta-Shield: Off
Peelout: Off
Peelout Animation: S2 Beta
Drop Dash: Off
Flight Cancel: Off
Super Cancel: Off
CD Drowning: Off
Super Music: Sonic 2
Timer: 0'00"00
Spring Twirl Animation: Sonic CD
Region: Miles
Rotation Type: Mania
MOD OPTIONS
Victory Animation: Absolute
Falling Animation: Off
Life Icon: Absolute
Walking Animation: Sonic 2
"Act" on Title Card: Off
Boss HUD: Off
Act 2 Music: On
Knuckles Style: Sonic 2
Boss Music: Sonic 2
Running Animation: Sonic 2
Lives HUD Style: Sonic 2
Super Team: Off
Air Curl: Off
Speed Shoe Music: Speed Up
Monitor HUD: Off
Drop Dash Animation: Absolute
Starpost Design: Sonic 2
Keep Shield: Off

--- Sonic 3 A.I.R. Settings ---
AUDIO
Soundtrack Type: Remastered
1-up Jingle: Pick by Zone
Invincibility Theme: Pick by Zone
Super/Hyper Theme: S3 Prototype
Mini-Boss Theme: Pick by Zone
Knuckles' Theme: Pick by Zone
Level Music: Usually, As Released
FBZ Laser Trap Boss: Mini-Boss Music
In Hidden Palace: Sonic & Knuckles
Sky Sanctuary Bosses: Sonic 1 & 2 Tracks
Outro Music: Sonic 3 Credits
Competition Menu: Sonic 3
Continue Screen: Sonic & Knuckles
On Level Start: Restart Music
Underwater Sound: Normal
VISUALS
Character Rotation: Mania-Accurate
Time Display: Extended
Lives Display: Auto
Speed Shoes Effect: After-Images
Fast Run Animation: Peel-Out
Flicker Effects: Slightly Smoothed
Outrun Camera: Off
Extended Camera: Off
Monitor Style: Sonic 3 & Knuckles
IceCap Startup Time: Morning Dawn
Blue Spheres Style: Classic
Ring Counter: Counting Down
GAMEPLAY
Level Layouts: Sonic 3 & Knuckles
Angel Island Bombing: Original
Big Arms Boss Fight: All Characters
Sandopolis Ghosts: Enabled
Lava Reef Act 2 Boss: 14 hits
Keep Shield after Zone: Disabled
CONTROLS
Sonic Drop Dash: Off
Sonic Super Peel-Out: Off
Sonic Insta-Shield: On
Tails Assist: Off
Tails Flight Cancel: Off
Roll Jump Control Lock: Locked
Bubble Shield Bounce: Sonic 3 Style
Tails Super Forms: Super & Hyper Tails
Super Cancel: Off
Super Sonic Jump Ability: None
Sonic Hyper Dash: Only when D-pad held
TWEAKS
Game Speed: 60Hz
Infinite Lives: Disabled
Infinite Time: Disabled
Shields: Elemental Shields
Randomized Monitors: Normal Monitors
Monitor Behavior: Default
Special Stage Layouts: Original On Fail: Advance to next
Region Code: Japan
Glitch Fixes: All
MODS
Falling Death Egg: Show
Replace Eggman in LRZ/DEZ: Yes
Restore Unused Icons: On
Sprite Type: Rawdata
HCZ1 Pool Palette: On
Missing FBZ2 Boss Frame: On
Missing LRZ2 Boss Frame: On
LBZ2 Bomb Chute: On
Robotnik Running Scared: Death Egg Only
Unique Tails Nametag: S3&K; Style
Sonic's Continue Screen: Robotnik After HPZ
Tails' Continue Screen: Unique
HCZ2 Knuckles Button: Unique
Data Select Robotnik: Original (No Shine)
Capsule Button Shading: Prototype
Flying Battery Spikes: Mania Style
FBZ2 Robotnik's Eyes: Tweaked
Green Objects: Green
Hydro City 2 Boss: Dark Gray
LRZ2 Boss Platforms: On
LRZ2 to HPZ Transition: Reload Main Palette
Mecha Sonic: Main Palette
Lightning Shield Obtain: As Released
FBZ Bomb Floor Destroy: Sonic 3&K;/Mania
LRZ Fireball Launcher: Sonic 3&K;
HPZ Boss Knuckles Spindash: Corrected
Mushroom Hill 2 Lever: On
DEZ1 Retracting Spring: On
Knuckles' Ending Sprites: On

--- Sonic 3 Complete Settings ---
ROM CUSTOMIZER
Mushroom Valley to Mushroom Hill: Enabled
Load On Startup: Sonic 3 Complete
GAMEPLAY OPTIONS
Zone Order: As Released
Flying Battery Style: As Released
Level Difficulty: Original
Sonic/Tails Layouts: Sonic & Knux
Knuckles Layouts: Sonic & Knux
Casual Gameplay: Off
Controls/Abilities: Sonic 3 / S3&K;
Speed Caps: Always Off
Tails Assist: Off
MUSIC OPTIONS
Zone Themes: Usually, Original
Theme Control: Pick by Zone
Event Control: Pick by Zone
Full Zone Medley: Sonic 3C
Super Theme: Special Theme
Fade Before Act Results: Off
Resume Music After Zone Ends: Off
On Level Restart: Restart Music