Jul -- The Cutting Room Floor: Level Select (or any other) code in MD Castle of Illusion?

ICEknight
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Posted on 08-04-14 05:04:19 PM (last edited by ICEknight at 08-04-14 05:05:20 PM)

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I remember that in 1991 a Spanish magazine published a code for Castle of Illusion that I could never get to work, and it was to simply hold all the buttons at once for a level selection cheat... I assumed that it might have been just taken out from the final version, but then I found this page in gamewinners.com.

Ignoring that it mixes this game with its sequel in a couple of places, it also gives a similar code for a free movement cheat!

Toggle collision detection:
Hold A + B + C and press Start. Mickey may now fly through the air and pass through walls, opponents, and items. Note: Repeat this code to return to normal mode.

..And since I've never seen any code work in this game and there's nothing about it in the wiki, I've got to ask: Has anybody ever heard about any working cheat code in this game?

koolaidman
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Posted on 08-04-14 06:49:44 PM

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I was working on a disassembly of the game a few months a go and couldn't locate anything that might hint at that.

The game stores the currently pressed button in two locations in memory (F310 and F308). F310 only changes during gameplay, while F308 changes while the game is running and even when the game is paused. The value sent to F310 when you press A+B+C+Start is B000. I imagine a subroutine moves the value currently stored in F310 to d0 or d1 and then tests with $B. It then branches if it's true. There are three subroutines that do this (sub_C62A, sub_C666, and sub_C718). I set a break point at the addresses of these subroutines but the game didn't seem to touch them. Hrm.

I remember doing something to the score count and it played a sound when the score was set extremely high. I thought that was kinda odd.

If you want to take a look at what I have so far, I'll throw it up somewhere. It might not be that helpful/accurate, since I did an active disassembly with Exodus first and looked at everything manually later. I forgot to mark down the location of Mickey's coordinates in memory I think, which would be useful in tracking down a no clip code.

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