Nds Decompiler

Decompilation is rarely a perfect "one-click" process. When a game is compiled, valuable metadata is permanently lost. Decompilers must overcome several major hurdles:

Let us walk through a real example. Assume you extracted arm9.bin from a commercial ROM using ndstool .

The main CPU responsible for game logic, 3D graphics engine calculations, and overall system management.

Summary An NDS decompiler is a specialized reverse-engineering toolchain combining ARM disassembly, data-format parsers, decompression, and asset extraction tailored to the Nintendo DS’s dual-CPU architecture and common game pipelines. It’s invaluable for modders, preservers, and researchers but must be used with care regarding legal and ethical constraints. nds decompiler

Decompiling the Nintendo DS: A Deep Dive into NDS Reverse Engineering

offers a free, scriptable command-line alternative. While its native decompilation is limited, you can install the r2ghidra plugin to access Ghidra's decompiler from within the radare2 environment.

Handles the main game logic, 3D graphics rendering, coordinate calculations, and heavy computational tasks. Decompilation is rarely a perfect "one-click" process

Retail NDS games do not include function names or variable titles. You will see names like FUN_020004a2 instead of Player_CalculateDamage . You must manually deduce what functions do based on their behavior and rename them.

Ghidra requires you to create a custom memory map for the NDS. Without it, the decompiler will produce nonsense like:

As of April 2026, several high-profile "matching" decompilation projects (where the goal is bit-for-bit accuracy) are active: Assume you extracted arm9

The best way to understand NDS reverse engineering is to see it in action. The community has made incredible progress decompiling some of the biggest games on the system. These projects serve as excellent blueprints for learning:

The decompiler will take some time to analyze the binary. Once complete, you will see a disassembly view (assembly) and a decompiled view (pseudo-C). Challenges in NDS Decompilation

Recognizing common compiler-generated code patterns (e.g., switch statements or for loops).

The efforts required to decompile an NDS game open doors to incredible developments that standard ROM hacking cannot achieve: