Ao Oni 30 Fix Link

Absolutely — if you want a smoother experience without changing the original gameplay. Purists might argue the choppiness is part of the horror charm. I say: try both. The 30 Fix makes chasing scenes less frustrating and modern hardware friendly.

However, some fangames break with the 30 Fix (timing-sensitive puzzles, script errors). Always check if the fangame was built with 30 FPS in mind.

Sometimes the RTP is installed, but Windows 10/11 blocks it. Use this surgical fix.

Step 1: Set Windows Compatibility
Right-click Game.exe → Properties → Compatibility tab.

Step 2: Manually Register the RGSS Script Engine
Open Command Prompt as Administrator. Type the following (adjust path if your RTP is elsewhere): ao oni 30 fix

regsvr32 "C:\Program Files (x86)\Common Files\Enterbrain\RGSS\Standard\RGSS102E.dll"

You should see a success message.

Step 3: Disable Fullscreen Optimizations (Windows 10/11)
In the same Game.exe Compatibility tab, check "Disable fullscreen optimizations". This prevents the Windows gaming overlay from conflicting with the old RGSS script call at line 30.

Step 4: Launch via Game.rxproj (If available)
Some versions of Ao Oni include the project file. Opening Game.rxproj (even without RPG Maker installed) can sometimes force the RTP to reinitialize. If asked, point it to your RTP folder. Absolutely — if you want a smoother experience

If you are a fan of Japanese horror RPGs, you have almost certainly heard of Ao Oni (Blue Demon). Since its release in 2008, this game has terrified millions with its simple puzzle mechanics and the relentless, glitchy pursuit of the blue-skinned monster. However, for a significant number of players, the terror begins before the monster even appears—at the startup screen.

You double-click the Game.exe file. The window pops up. You see the title screen. Then, suddenly, a stark white dialog box appears with the cryptic message: "Script 'Game_Message' line 30: RuntimeError occurred."

This is the infamous "Ao Oni 30 Fix" —a search query that haunts forums like Reddit, Steam Community, and RPGMaker.net. Why is this error so common, and more importantly, how do you fix it permanently?

This article provides a definitive, step-by-step breakdown of the causes and solutions for the Ao Oni line 30 runtime error. Step 2: Manually Register the RGSS Script Engine

To fix the error, you must first understand what "Line 30" represents. Ao Oni was built using RPG Maker XP (or VX, depending on the translation). The "Game_Message" script controls text boxes and dialogue.

In the original Japanese release, the game uses a specific font (usually MSGothic or UmePlus Gothic). Most Western PCs do not have this font installed. When the game reaches line 30 of the Game_Message script—the line that tells the computer to "draw the text using Font X"—the system panics. It cannot find the font, so it throws a RuntimeError.

In short: The "Ao Oni 30 fix" is almost always a font issue.

However, there are secondary causes, including: