How Do Cheat Codes Work?
A detailed but beginner-friendly explanation of built-in secrets, GameShark, Action Replay, CodeBreaker, Gecko, Gateshark, CTRPF and modern Nintendo Switch cheat formats.
A cheat code can be a secret command intentionally built into a game, or an instruction interpreted by an external device or software-based cheat engine. Although both are called “cheats”, they work in very different ways.
A developer-created button combination asks the game to activate behaviour that already exists in its program. A GameShark-style code usually works outside that normal menu logic: it tells a cheat engine to read, compare or change particular data while the game is running.
This guide explains those ideas without assuming programming knowledge. It also explains why the same code may work on one cartridge, region or update but fail on another.
The two main types of video game cheat codes
Built-in cheat codes
These are deliberately programmed by the developer. A sequence of buttons, a password, a menu command or a hidden name triggers code already inside the game.
Classic uses include level selection, debug functions, bonus modes and accessibility or testing shortcuts. Because the game recognises the command itself, no external memory editor is required.
External cheat-engine codes
Devices and software such as GameShark, Action Replay, CodeBreaker and modern cheat engines interpret instructions that inspect or modify the running game.
The visible code may contain an operation type, an address, a value, a comparison, a repeat count or a button condition. Its exact meaning depends on the system and code format.
How memory-changing cheat codes work
While a game runs, it keeps temporary information in memory. Depending on the game, that information may include health, currency, inventory quantities, coordinates, timers, battle state and menu selections.
Think of memory as a huge collection of numbered storage locations. A location is identified by an address, while the information stored there is the value. A simple cheat tells the engine to place a chosen value at a chosen address.
ADDRESS 0x12345678 → VALUE 999Conceptually, this means “write the number 999 to this location.” The real code may encode its operation, address and value differently.
An infinite-health code often writes the maximum health value repeatedly. A money code may need to write only once. A movement code may change executable instructions rather than a simple number. More sophisticated formats can follow pointers, conditionally branch or write a sequence of values.
What the lines in a cheat code mean
Cheat formats behave like small, specialised instruction languages. The first part of a line frequently helps identify the operation, while the remaining digits provide an address, value or parameter. You cannot reliably determine a line’s meaning from its appearance alone because every format defines its own rules.
Direct writes
Place an 8-bit, 16-bit or 32-bit value at an address. The size controls how much data is changed.
Conditional codes
Read a value first and execute following lines only when a condition is true—for example, while a battle flag is active.
Button activators
Apply a code only while a specified controller input is pressed. This lets one code be switched during gameplay.
Repeated writes
Write a pattern across several locations, useful when a table or group of inventory entries must be changed.
Pointer operations
Find data whose location moves between sessions by reading one address and following it to another.
Program patches
Replace a small instruction executed by the game. These can produce complex effects but are particularly version-sensitive.
What is a master code?
A master code—also called an enable code—prepares certain physical cheat devices to interact with a particular game. Depending on the device and system, it may identify the game, establish a code-handler hook or arrange for the cheat engine to execute at the correct time.
Not every platform, emulator or cheat format needs one. Adding an unrelated master code can prevent otherwise valid codes from working. Use one only when the guide and device documentation explicitly require it, and never combine master codes from different regions or revisions.
Why region, revision and update version matter
The same game name can refer to several different executable builds. Localisation, bug fixes, censorship changes, later cartridge printings and downloadable updates can all move data or change program instructions.
| Identifier | What it tells you | Why cheats care |
|---|---|---|
| Region | Such as USA, Europe or Japan | Regional builds can place data at different addresses. |
| Revision | A later cartridge or disc build | Internal code may have changed even when packaging looks similar. |
| Version | For example, v1.0 or v1.4 | An update can move memory and invalidate earlier patches. |
| Game ID / Title ID | Identifies a particular title or release | Cheat managers use it to associate codes with the correct game. |
| Build ID | Identifies a particular compiled executable | Modern Switch cheats are commonly loaded for an exact build. |
This is why CheatCodeDB separates Pokémon Omega Ruby v1.0 cheats from Pokémon Omega Ruby v1.4 cheats. The intended effect may be identical, but the required address can differ.
How cheat codes work on each Nintendo console
Game Boy and Game Boy Color
Game Genie codes commonly alter data read from the game program, effectively substituting selected values as the game runs. GameShark-style devices can instead modify working memory, which is useful for changing quantities and current game state.
Cartridge banking and regional differences mean the apparent location of data can vary. A code for Pokémon Red should never be assumed to work in Pokémon Blue, Yellow or another regional build merely because the games are related.
Game Boy Advance
GameShark, Action Replay and CodeBreaker became common GBA formats. Physical devices sat between the console and cartridge and interpreted code lists before or during play. Formats can include direct RAM writes, conditional operations, button activators and ROM patches.
Some visually similar codes use different encryption or interpreter versions. A 16-character Action Replay v3 code is not automatically interchangeable with an earlier Action Replay/GameShark format. This is why a guide should state the exact device type instead of labelling everything “GameShark”. Technical GBA documentation describes these devices as patching specified memory locations for a particular game.
See the practical example in our Pokémon Emerald GameShark codes guide.
Nintendo 64
N64 GameShark cartridges could run a code handler alongside the game. Common codes write values to RAM, compare existing values or activate changes using controller input. Some titles require an enable code so the handler works with that game’s boot process.
USA, European and Japanese releases often need separate address sets. Expansion Pak usage and game revisions can also affect compatibility in individual titles.
GameCube
Action Replay codes for GameCube can perform memory writes, comparisons and executable patches. On compatible software environments, codes are associated with a particular game identifier and interpreted while the title runs.
Disc region and revision remain important. A code intended for one release may target unrelated data in another, particularly when it replaces PowerPC instructions rather than a simple gameplay value.
Nintendo Wii
Wii guides often use Gecko codes. These support operations including memory writes, conditions, pointer-based addressing and injected instruction sequences. A loader must execute the code handler at appropriate points while the game runs.
Game IDs, regions and revisions identify the intended executable. Longer C2-style patches are effectively small program modifications and are much more sensitive to build differences than a basic value write.
Nintendo DS
Action Replay DS codes are interpreted by a cheat engine that can write memory, evaluate conditions, repeat operations and respond to buttons. A game identifier helps associate the code database with the inserted title.
The DS’s two processors and different memory areas make its code language more capable than a simple address-and-value list. Nevertheless, the basic rule remains: the code must match the game, region and revision.
Nintendo 3DS
Gateshark and CTRPF Action Replay-style codes can express writes, conditions, loops, pointer operations and button activators. Guides commonly identify a 3DS game using its Title ID, then separate codes by update version because updates can change the executable and memory layout.
A Title ID alone is not enough. Pokémon Omega Ruby v1.0 and v1.4 share the same game identity but require separate compatibility checks. Different cheat plugins and emulator-derived builds may also support different subsets of the format.
Nintendo Switch
Modern Switch cheat files used by Atmosphère’s cheat service are associated with a program and a specific executable Build ID. Atmosphère documents a path containing the program ID and Build ID, illustrating why an update normally requires a matching cheat file.
The format supports direct writes, conditions, loops, registers and pointer operations. Because modern games often allocate data dynamically, pointer-based codes are more common. A cheat created for v1.0.0 should not be assumed compatible with a later patch—even when the game launches normally.
How are cheat codes discovered?
At a high level, researchers compare game state with changing memory. Imagine recording the current money value, earning some money, and then narrowing the search to locations that changed in the expected way. Repeating this process can identify a candidate value.
Finding a stable, shareable code is harder. The researcher must determine whether the address remains valid after reloading, whether a pointer is required, whether the value is encoded, and whether the result works on another copy of the same build. Program patches require understanding the game’s machine instructions and testing what happens when a specific instruction is replaced.
This explains why responsible code databases include the author or source, game build, format, activation instructions and testing status instead of presenting an unexplained string of digits.
Why cheat codes sometimes crash games or damage saves
A code has no understanding of your intentions. It executes the operations it was given. If an address is wrong, the engine may overwrite unrelated data. If two cheats target connected systems, each may undo or conflict with the other. A continuously running code can also keep forcing a value after the game expects it to change.
Before using a code
- Back up the save.
- Confirm title, region and version.
- Check the required format.
- Read activation instructions.
- Start with one code.
After activating it
- Confirm the expected result.
- Disable write-once codes.
- Avoid saving after obvious corruption.
- Do not use cheats in competitive online play.
- Restore the backup if behaviour changes unexpectedly.
Why a cheat code may not work
| Symptom | Likely explanation | What to check |
|---|---|---|
| Nothing changes | Wrong format, version, region or inactive code | Verify all four before replacing the code. |
| Game freezes | Bad address, conflicting code or incompatible patch | Close without saving and retest one code. |
| Effect disappears | The game naturally rewrites the value | The code may need continuous execution. |
| Works only sometimes | A button, location or game-state condition is required | Read the activation notes carefully. |
| Wrong item or character appears | Incorrect identifier table or regional difference | Confirm the guide matches the exact release. |
| Code is not listed by software | Incorrect game ID, Title ID or Build ID | Compare identifiers with the installed build. |
Frequently asked questions
Are cheat codes part of the game?
Built-in button combinations and passwords are part of the game. External GameShark, Action Replay and similar codes are instructions interpreted by another device or software component.
Why do cheat codes contain hexadecimal numbers?
Hexadecimal is a compact way to represent binary data, addresses and instruction fields. It uses digits 0–9 and letters A–F.
Why does the same cheat have different codes?
Different regions, revisions, updates, devices and code formats may target different addresses or encode the same operation differently.
What is the difference between GameShark and Action Replay?
They are product families with several system-specific formats and revisions. The names are sometimes used loosely online, but their codes are not universally interchangeable.
Can a cheat code permanently change a save?
Yes. Item, progress, character and inventory changes may be written into the save. A malformed or incompatible code can also corrupt data, which is why backups matter.
Do emulator cheats work on original hardware?
Not automatically. Compatibility depends on whether the emulator and physical device implement the same code format and whether the code matches the same game build.
Why do Nintendo Switch codes need a Build ID?
The Build ID identifies the compiled executable. When an update changes that executable, addresses and instructions can move, so a matching cheat file is normally required.
Are cheat codes illegal?
Laws and service terms vary. Using a code in your own offline game is different from distributing copyrighted game files, bypassing access controls or disrupting online competition. Use legally obtained games and follow applicable platform and service rules.
Video example: how GameShark codes work
If you would rather see the idea explained visually, this educational example discusses how GameShark codes relate to memory addresses and values. Watch it after reading the memory section above: terms such as address, bit and value should then be much easier to recognise.
Third-party educational video: How do GameShark codes work? The embedded player uses YouTube’s privacy-enhanced domain. Availability and content are controlled by the video publisher.
Explore practical examples
Technical references
This overview was checked against GBATEK’s GBA and DS technical documentation, the Atmosphère cheat-service documentation, OpenEmu’s cheat-format compatibility notes and the educational resources at GameHacking.org. Implementations vary, so consult the documentation for the exact device or software you use.
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