---
title: "これはマジで信じられない！AIエージェントが1996年のWindowsゲームを何もなしで再構築中"
url: "https://reamcp.dev/ja/cases/this-is-f-cking-unreal-ai-agents-are-rebuilding-a-1996-windo-90f38a"
source: "https://x.com/i/status/2110485237054742876"
source_type: "x"
author: "angel"
author_handle: "angel404l"
stars: 0
category: "失われたソースの復元"
categories: ["source-recovery"]
tags: ["binary-analysis", "ghidra", "ida", "reverse-engineering", "source-recovery"]
added: "2026-10-17T02:25:54.514Z"
updated: "2026-10-14T21:39:35.000Z"
locale: "ja"
content_locale: "ja"
---

# これはマジで信じられない！AIエージェントが1996年のWindowsゲームを何もなしで再構築中

AIエージェントがREA（リバースエンジニアリングMCP）を使用してDX-Ball実行ファイルから関数を復元し、元のx86コードとバイト単位で比較しながらCバージョンを1関数ずつ再構築した方法を説明するXの投稿。

## Description

著者は単一の関数復元を順を追って説明している：関数0x406400を分析し、呼び出し元を追跡して画面位置の計算式を導き出し、.exeから2つの定数を読み取り、3,205のテストケースと1996年当時のコンパイラを使用したバイト単位で同一の再コンパイルで再実装を検証する。投稿は55の関数が書き換えられ、45,380のチェック、33のバイト単位で同一の関数を報告し、REAが23のターゲットタイプをカバーし、npx rea-agentsによるワンコマンドセットアップを提供することに言及している。リポジトリのリンクは提供されておらず、元の商用ゲームをリバースエンジニアリングする権利についても述べられていない。

## Original README

THIS IS F*CKING UNREAL! AI AGENTS ARE REBUILDING A 1996 WINDOWS GAME WITH NOTHING BUT THE .EXE

the game is DX-Ball. no source code. no docs. just the original executable

and REA, the MIT-licensed reverse engineering MCP sitting at 238,000 stars on GitHub

the goal: a clean, maintainable C version of the whole game, recovered 1 function at a time

here's 1 function, start to finish

question: when a brick breaks, which speaker plays the sound?

the agent asked REA 3 things:

→ analyze_function 0x406400 - the decompiler said the function was empty. the raw instructions showed a hidden integer input
→ follow the caller - the brick-hit code turns a tile into a screen position: 20 + 30 × tile_x
→ read_bytes - 2 constants buried in the .exe decode to 1.5625 and 500.0

the whole formula:

pan = (x × 1.5625 − 500.0) × scale

-500 on the left edge. 0 in the middle. +500 on the right

then it had to prove it wasn't guessing:

> 3,205 test cases run against the original x86 code
> every position from 0 to 640, at 5 pan scales
> recompiled with the 1996-era compiler: all 63 bytes identical

the project so far:

> 55 functions rewritten in C
> 45,380 checks against the original
> 33 functions that compile byte-for-byte the same

and it's not just old games. REA covers 23 target types: native binaries through Hopper, Ghidra or IDA, Electron apps, .NET, Android APKs, websites, firmware, network captures

1 command to start:

npx rea-agents setup

then hand your agent a binary you're allowed to inspect and paste this:

"Use REA to recover 1 function from this executable

1. Analyze the function and its callers. Show the instructions behind every claim, not just the pseudocode
2. Read and decode every constant or global it depends on
3. Write a C version with the same inputs and outputs
4. Build a test that runs the original and your version across the full input range. Report every mismatch"

start with 1 small function you can fully verify

the decompiler said empty. the bytes said otherwise.

full case study:

https://github.com/morluto/rea
https://rea.tools/showcase/dx-bal