Guide

The SCHG How-to: series is a spinoff from the Sonic Community Hacking Guide with a focus on how-to, tutorials, and supplementary education. Whereas the traditional SCHG serves more as a map for users to navigate a ROM for themselves, the How-to series is more a "how to get from point A to point B" set of directions. Tutorials range from the very basic to very complex, with an eye towards making sure no part of the process is assumed or left out.

General How-Tos

• Work with Motorola 68000 Assembly (by redhotsonic)
• Work with Objects (by Malevolence and MarkeyJester)
• Use a Hex Editor (by Scarred Sun)
• Edit Palettes Using Hex (by Scarred Sun)
• Use SonMapEd/Part 1 (by Chimpo)
• Use SonMapEd/Part 2 (by Chimpo)
• Import Art to SonED2 (by iojnekns)
• Set Up SonLVL (by MainMemory)

Game-Specific

Sonic 1

Fixing Bugs

These guides describe the steps to take to fix bugs that are present in the original game or bugs that occur after altering something in the game.

• Fix Demo Playback (by FraGag)
• Fix a Race Condition with Pattern Load Cues (by FraGag)
• Fix the SEGA Sound (by Puto)
• Display the Press Start Button Text (by Quickman)
• Fix the Level Select Menu (by STHX)
• Fix the Hidden Points Bug (by 1337Rooster)
• Fix Accidental Deletion of Scattered Rings (by redhotsonic)
• Fix Ring Timers (by redhotsonic)
• Fix the Walk-Jump Bug (by Cinossu)
• Correct Drowning Bugs (by redhotsonic)
• Fix the Death Boundary Bug (by MarkeyJester)
• Fix the Camera Follow Bug (by MarkeyJester)
• Fix Song Restoration Bugs (by MarkeyJester and Clownacy)
• Fix the HUD Blinking (by Quickman)
• Fix the Level Select Graphics Bug (by MarkeyJester)
• Fix a remember sprite related bug (by MarkeyJester)

Changing Design Choices

These guides describe how you can alter some behaviors in the game that might not be to your liking.

• Change Spike Behavior (by FraGag)
• Fix the Special Stage Jumping Physics (by Mercury)
• Improve the Fade In\Fade Out Progression Routines (by MarkeyJester)
• Fix Scattered Rings' Underwater Physics (by redhotsonic)
• Remove the Speed Cap (by Tweaker and Puto)
• Port the REV01 Background Effects (by jman2050)
• Port Sonic 2's Level Art Loader (by Clownacy)
• Retain Rings Between Acts (by Afti)
• Add Sonic 2 (Simon Wai Prototype) Level Select (by Kram1024)
• Add Sonic 2 Level Select (by DelayHacks)
• Improve ObjectMove Subroutines (by redhotsonic)
• Editing Title Cards (by CK15)
• Collide with Water After Being Hurt (by MoDule)
• Smooth Out Rotation in Special Stages (by XPointZPoint)

Adding Features

These guides describe step-by-step how to add new features in the game. After following one of these guides, the feature should be fully functional in the game with no further work.

• Add Spin Dash/Part 1 (GitHub version) (by DikinBaus)
• Add Spin Dash/Part 1 (Hivebrain version) (by Lightning)
• Add Spin Dash/Part 2 (by Puto)
• Add Spin Dash/Part 3 (by shobiz)
• Add Spin Dash/Part 4 (by Mercury)
• Have a Functional Eggman Monitor (by nineko)
• Add Super Sonic (by Shadow05)
• Add Extended Camera (by Nat The Porcupine)
• Add the Air Roll (by Inferno Gear)
• Add 6-Button Support (by Gardeguey from the SSRG archives)

Sound Features

These guides cover the application of music and sound effects in the game. After following these guides, porting and adding original music should be possible.

• Expand the Sound Index (by Alex Field)
• Play Different Songs on Different Acts (by nineko)
• Port Sonic 2 Final Sound Driver (by Kramlat)
• Port Sonic 3 Sound Driver (by Kramlat)
• Change The SEGA Sound (by XPointZPoint)

Extending the Game

These guides will prepare you to introduce new content in the game. Merely following these guides will usually have no immediate effect in the game; you will need to provide custom content.

• Load Chunks From ROM (by FraGag)
• Add Extra Characters (by Sonic 65)
• Make an Alternative Title Screen (by JcFerggy)
• Use Dynamic Tilesets (by HPZMan)
• Separate Title Art From GHZ/Make GHZ Load Alternate Art (by MKAmeX)
• Separate Ending Art From GHZ/Make Ending Load Alternate Art (by JGMR)
• Add a New Zone (by FraGag)
• Set Up the Goggle Monitor to Work with it (by Selbi)
• Add New Moves (by Ravenfreak)
• Add a Dynamic Collision System (by theocas)
• Dynamic Special Stage Walls System (by Mercury)
• Extend the Sonic 1 Sprite Mappings and Art Limit (by MarkeyJester)
• Add Enigma Credits (by Fukuller)
• Use Dynamic Palettes (by Cinossu and Shadow Fire)

Miscellaneous

• Convert the Hivebrain 2005 Disassembly to ASM68K (by Puto)

Qjimbo's Split Disassembly Guides

These guides were formerly hosted on The Glowing Bridge.

• Set up a Sonic 1 Split Disassembly (by Qjimbo)
• S1 Split Guides/Basic Level Editing (by Qjimbo)
• S1 Split Guides/Basic Art Editing (by Qjimbo)
• S1 Split Guides/Basic ASM Editing (Spin Dash) (by Qjimbo)

Sonic 2

Fixing Bugs

• Fix Demo Playback (by FraGag)
• Fix Sonic 2's Sega Screen (by RobiWanKenobi)
• Fix a Race Condition with Pattern Load Cues (by FraGag)
• Fix Bugs Relating to Super Sonic (by MoDule)
• Use Correct Height When Roll Jumping (by MoDule)
• Fix Jump Height Bug When Exiting Water (by MoDule)
• Fix Screen Boundary Spin Dash Bug (by flamewing)
• Correct Drowning Bugs (by redhotsonic)
• Fix Camera Y Position for Tails (by MoDule)
• Fix Tails Subanimation Error (by redhotsonic)
• Fix Tails' Respawn Speeds (by redhotsonic)
• Fix Accidental Deletion of Scattered Rings (by redhotsonic)
• Fix Ring Timers (by redhotsonic)
• Fix Rexon Crash (by redhotsonic)
• Fix Monitor Collision Bug (by redhotsonic)
• Fix the EHZ Deformation Bug (by qiuu)
• Correct CPZ Boss Attack Behavior (by redhotsonic)
• Fix Bug in ARZ Boss Arrow's Platform Behavior (by MoDule) (addition by redhotsonic)
• Fix ARZ Boss Walking on Air Glitch (by MoDule)
• Fix ARZ Boss Sprite Behavior (by redhotsonic)
• Fix Multiple CNZ Boss Bugs (by redhotsonic)
• Fix HTZ's Background Scrolling Mountains (by flamewing)
• Fix the OOZ Launcher Speed Up Glitch (by MoDule)
• Fix DEZ Eggrobo Boss Collision Glitch (by flamewing)
• Fix Boss Deconstruction Behavior (by Esrael & redhotsonic)
• Fix Speed Bugs (by redhotsonic)
• Fix OOZ Music Bug (by Shadow05)

Changing Design Choices

• Remove the Air Speed Cap (by Selbi and Puto)
• Disable Floor Collision While Dying (by Esrael)
• Modify Super Sonic Transformation Methods & Behavior (by vladikcomper & redhotsonic)
• Enable/Disable Tails in Certain Levels (by Tamkis)
• Collide with Water After Being Hurt (by MoDule)
• Retain Rings When Returning at a Star Post (by Mercury)
• Improve the Fade In\Fade Out Progression Routines (by MarkeyJester)
• Fix Scattered Rings' Underwater Physics (by redhotsonic)
• Insert LZ Water Ripple Effect (by MoDule)
• Restore Lost CPZ Boss Feature (by Esrael)
• Prevent SCZ Tornado Spin Dash Death (by Esrael)
• Improve ObjectMove Subroutines (by redhotsonic)
• Port S3K's Rings Manager (by shobiz)
• Port S3K's Object Manager (by MoDule)
• Port S3K's Priority Manager (by redhotsonic)
• Edit the Level Order in Sonic 2 with ASM‎ (by Malevolence and Metal_Man88)
• Alter the Ring Requirements in the Special Stages (by Mercury)
• Change the Special Stage Characters to Use Normal DPLCs (by flamewing)
• Speed Up Ring Loss Process (w/ Underwater) (by redhotsonic)
• Resize Levels in Sonic 2 (by lavagaming1)
• Disable animated tiles in sonic 2 (by lavagaming1)
• Restore Hidden Palace pulsing orb (by lavagaming1)

Adding Features

• Create Insta-kill and High Jump Monitors (by Tamkis)
• Create Clone and Special Stage Monitors (by Tamkis)
• Port Knuckles (by MainMemory)
• Add Extra Item Options for 2 Player VS Mode (by Cinossu and E-122-Psi)

Sound Features

• Port Sonic 1 Sound Driver (by Tweaker)
• Port Sonic 2 Clone Driver (by Caverns 4)
• Port Sonic 3 Sound Driver (by Kram1024)
• Play Different Songs on Different Acts (by nineko)
• Expand the Music Index to Start at $00 Instead of $80 (by Clownacy)
• Expand the Music Index to Start at $00 Instead of $80 (Sonic 2 Clone Driver Version) (by Mikel, based on a guide by HPZMan)

Extending the Game

• Extend the Level Index Past $10 (by Kramlat)
• Extend the Level Select (by Clownacy)
• Extend the Water Tables (by Dani)
• Add Extra Characters (by Manic Remix)
• Free Up 2 Universal SSTs (by redhotsonic)

Sonic 2 Nick Arcade

Fixing Bugs

• Fix the EHZ Deformation Bug (by qiuu)

Changing Design Choices

• Add final spindash to Sonic 2 Beta (by Shadow05)
• How to port paralax plouds to the Nick Arcade prototype (by Shadow05)

Sonic 2 Beta

Fixing Bugs

• Fix the EHZ Deformation Bug (by qiuu)

Changing Design Choices

• Add final spindash to Sonic 2 Beta (by Shadow05)

Sonic 2 Master System

• Add Dynamic Palettes (by Mikel)
• Relocate Player Object Logic (by Glitch)
• Add a Custom Badnik (by Glitch)
• Add a New Monitor (by Ravenfreak)
• Add a Second Digit to the Lifecounter (by Ravenfreak)
• How to Add New Tiles in Different Acts (by Ravenfreak)

Sonic 3 Alone

Fixing Bugs

Currently empty. Add your tutorials here!

Changing Design Choices

Currently empty. Add your tutorials here!

Adding Features

• Restore Sonic 2 Menus (by Mustapha)

Sonic 3 & Knuckles

Fixing Bugs

• Fix Blue Knuckles (by Tamkis) (addition by AlexShx and BlueKnuckles04)
• Fix Tails' Respawn Speeds (by redhotsonic)
• Fix Accidental Deletion of Scattered Rings (by redhotsonic)
• Fix Ring Timers (by redhotsonic)
• Use Correct Height When Roll Jumping (by MoDule) (S3K fix by ThomasSpeedrunner)

Changing Design Choices

• Fix Scattered Rings' Underwater Physics (by redhotsonic)
• Edit Level Select Text and Pointers (by Inferno Gear)
• Work with Water in S3K (by Katelynn)
• Make the Slots Bonus Game Rotate Smoothly (by Dullhole)

Adding Features

• Port the options menu from Sonic 3 (by makotoyuki)

Sonic Advance 3

• Switch Characters For Nonaggression (by Erik JS)

Sonic Adventure 1/DX

• Edit Sonic Adventure Levels (by Polygon Jim)
• Import Levels Into Sonic Adventure DX: PC Using SADXLVL2 (by ShadowBlitz)

Sonic Heroes

• Assign Custom Materials to objects without additional materials in Sonic Heroes (by Muzzarino)
• Creating Levels in Sonic Heroes (by Igorseabra4)

Sonic Generations

• Import Levels (by Sky The Destroyer)
• Create Breakable Objects (by Paraxade)
• Create Splines (by Faseeh)

To add your own how-to, simply add an article with SCHG How-to: before the name, which will register it with the correct namespace.