is the industry heavyweight. While the free version offers limited ARM support, the full commercial release includes the Hex‑Rays decompiler, which produces higher‑quality C‑style output than any free alternative. As one experienced user notes, "IDA PRO is much better than any of the free arm disassemblers and I highly recommend getting it if you want to do any serious reverse engineering work".
: A high-end reverse engineering suite that can decompile the binaries found in NDS files into C code.
Runs at 67 MHz. It handles most of the game logic, 3D graphics engine, and file systems. nds decompiler
When you open an NDS ROM, you are not looking at a single program, but rather a file system containing separate binaries for both the ARM9 and ARM7 processors, alongside overlays (code loaded dynamically into RAM during gameplay). A competent NDS decompiler must be able to handle ARM-architecture machine code, specifically distinguishing between standard 32-bit ARM instructions and compact 16-bit Thumb instructions. Top NDS Decompilers and Reverse Engineering Tools
have been raised in scholarly contexts, suggesting that decompilation for purposes of preservation, research, or interoperability might qualify as fair use. One legal analysis frames decompilation developers as "debatably an adverse possessor of video game copyright" seeking a fair use defense against infringement claims. Decompilations touch on larger intellectual property questions: "the extent of the public's right to expect that a creative work remains accessible (e.g., on modern hardware)". is the industry heavyweight
The original compilers used by Nintendo (like the ARM Workbench v2.0) optimized the code for speed. This means loops might be unrolled, or math operations might look incredibly bizarre in C, requiring deep knowledge of assembly to decipher. Use Cases: Why Decompile NDS Games?
By using community plugins like Ghidra-NDS-Loader , you can drag and drop an .nds ROM directly into Ghidra. The plugin automatically parses the ROM header, splits the ARM9 and ARM7 binaries, maps the correct memory addresses, and names standard hardware registers. 2. IDA Pro / IDA Free : A high-end reverse engineering suite that can
Keep in mind that decompiling copyrighted materials, like games, may be subject to legal restrictions. Always ensure you have the necessary permissions or rights to work with the materials you're decompiling.
While an cannot magically spit out the original source code with a single click, tools like Ghidra paired with community loaders make reverse engineering Nintendo DS games more accessible than ever. Whether your goal is to port a childhood favorite to PC, fix historical bugs, or build an expansive romhack, mastering the decompilation pipeline is the ultimate way to unlock the secrets hidden within NDS hardware.