Brad Corrupts: Sonic the Hedgehog 2 Volume 1 (exception bypass hack)

[@BradCorrupts]

Notice: the jump sounds sounding off is not due to the corruptions but due to the fact that I was using Gens at the time, which was notorious for having inaccurate sound emulation. Unfortunately it was the most convenient emulator to use at the time (remember, this was made a decade ago at the time of this writing). Since then, more accurate emulation has become available. Maybe someday I'll go back and remaster these old videos as the poor sound isn't the only thing I'm unhappy about with these early Genesis videos.

[@SquidPartyDude]

First :)

[@BradCorrupts]

@@SquidPartyDude Were you just, hanging out on this video until I got around to making the pinned comment, or?

[@SquidPartyDude]

@@BradCorrupts Nope Just Realized it

[@TechGamer64960]

this is some sonic.exe level shit

[@BradCorrupts]

@@TechGamer64960 Thanks, hoping to retain that a bit when I remake it.

[@SnancyNegative]

9:58 started as such a good remix... then everything changed when corruption hit at 10:18

[@timeshifterstellar]

3:08 sonic: tails gimme a hug! sonic hand: I dislike this madness!

[@nargacugaboiss9957]

creepy song 17:06

[@greenknight9000]

still more playable than sonic 06

[@cwiz825]

3:07 that's weird Sonic put the thumbs down at you 😂😂😂😂😂

[@BradCorrupts]

Yeah that gave me a hearty chuckle when I first saw it.

[@Akendolfr]

Sonic.exe ain't got shit on this.

[@СергейШиханов-б2о]

9:58 Oh Yes

[@invalid_user_handle]

Considering you managed to make it so that if a error happens that it just goes ahead 2 bytes of data and runs it to bypass errors, that's perfect for genesis games, because those corruptions have a notable habit of crashing often.

[@gabrrielbicudo]

0:00 21:21 Sonic 2 Corruptions 09

[@nargacugaboiss9957]

dat intro tho 3:00

[@kelleysanders6396]

Bal Dragon /Dragon Of The Sun/ best intro ever 10 out of 10

[@YourTypicalRemixer]

8:20 they are still working on the level, you can hear the hammers

[@doctorwhofan290]

Is that the Mega Drive Screaming? 0:28

[@FloorMegumin]

6:25 this is what look sonic 2 special stages in a calculator

[@MegAmi24]

3:02 Sonic, you come up, not POP up... Sonic, WTF R U DOING?!

[@SquidPartyDude]

5:24 Sonic CD/Generations Jump SFX

[@BradCorrupts]

At the time of making this video I was using an emulator that was well known for having pretty inaccurate sound emulation. I think I'm going to have to pin a comment clarifying this, it seems.

[@SquidPartyDude]

@@BradCorrupts Ok I putted that thankfully

[@TorutheRedFox]

13:20 the 0 on the timer has tails

[@lemonadesnake]

19:05 the jump turned into sonic cd

[@darkspongebob11]

7:50 the top bar says ore hass sonic been mineing or somehing?

[@LatteWiiU]

i love this game! its the best and so fun! my fav course is chemical plant zone!

[@BradCorrupts]

I've always been a sucker for Casino Night Zone myself.

[@TailsClassico14Oficial]

Emerald hill is emerald labyrinth xd

[@BradCorrupts]

yup, that's what corrupting compressed level data will get you.

[@smortypi]

G̹͕̰̞͉̟̬͌͒̔͜Ġ̡͕̞͙̆͊̉̈́G͕̫͎̤͕̣̳͍͌͛̽̂ͤ͐͒̑ǒ̱̣͒̀ͥ̂̚͝Tͪ͂̉͏̩̼̥t̢̪͈̟̼̖̫̰̄͑͞ͅṱ̶̛̫̙͈̗͕͗͋͒͆A̢͈͌̾̐̈́ͥ̅ͥ͂ ̧̝̹͖͆̾ͣ̎ͦͦG̵̖͚͉̠͛̅ͮͅŐ͉̹͈̘͇̮̂̃̽͂̓͆̓́ͅO̩̼̲͎̓ͫ̓̈́̀̒̚̚͜ͅŏ̷̢̜͔̩̣̣͈͕͖̂̍̔̈G̨̳̼͕̪͕̙͔̖̋̑̔͗̌̄͐͢͞ ̩͓̱͔̐ͧ̓̀ͧ̇ͧF̲̣̹̼̜̮̤̎̃͊͂̍ͬ͌Å̢̤̺̟̘̱̩̟̖̯ͤͥ̀A̻͖̯̗̫̦̫̬̿̊ͭ͢A̴̮̋ͯ̚͝ͅs̵̡̘͂ͣ̽̐̔͐s̖̹̞̰̼̝̑̔̒ͫ̄͟͝š̴̨͓̄̏T͕̬̝ͪ̄͛̒͟S̻̫̭͕͚̆͒͗̉ͬ͊̀ṯ̵̨͕͇͍̼̱͒ͧ

[@KitaxNekoSama57]

Well, This corruption has less glitches than Sonic 06.

[@ExtremeWreck]

XD

[@yaskravazirka]

4:54 *through 1*

[@BradCorrupts]

@danooct1 2 more Sonic 2 vids are planned, then I'm going back to NES for a bit. When I do decide to do other Genesis games though, it'll probably be games that have been extensively researched, like the sonic series. Other games would be VERY hard to write scripts for, and unless there's a way to easily find compresion in those games (if there is), it's unlikely that I'll do them.

[@LikaLaruku]

Green Hill Zone just became Ear Hurt Zone. 3:02 Dufuq? #5: The REAL Shadow the Hedgehog. #6: Like a Creepypasta that writes itself. I never knew you could drown in Casino Night Zone.

[@haroldgamer6556]

iteration 8 is the best thing ever hands down

[@Darlos9D]

The most interesting part to me was how in one iteration, the spikes in the first level were moving up and down. I guess that functionality is built into all of the spikes in the game, and whether or not they behave that way is some kind of switch.

[@ExtremeWreck]

The 1st one has them sound like mice lol. Oof, that 4th iteration is like Sonic.EXE taking over. Iteration 5: Racist Sonic lol

[@Fluffledump]

I really hope this is the first thing Aliens see when they come to earth.

[@KushWW]

I agree with u

[@ExtremeWreck]

The aliens would be like: "So this is how they communicate with mice."

[@BradCorrupts]

I believe that's what he's trying to say, yes.

[@TechnoTranceBrony]

I would agree, but some glitchy tiles will appear on the "GREEN HILL ZONE" screen, causing the text to get corrupted afterward as well.

[@BradCorrupts]

What I use is a custom script that I wrote myself. Zophar has utilities that do the same thing, but in a more limited fashion.

[@MrJum987]

3:07 So now we know that Sonic was one of the 5 dislikes on this corruption.

[@BradCorrupts]

Oh I dunno, a few reasons.... because I can, because I enjoy it, because other people enjoy it, because it's entertaining/funny, etc etc....

[@pikatheminecrafter]

Hill Top Zone and Emerald Hill Zone have similar elements in their music. Very cool.

[@Greysmdl]

17:17 music is creepy pasta fuel.

[@Greysmdl]

excellent

[@BradCorrupts]

I used Kega Fusion for the last one I believe. I swear there's an auto checksum fix around there somewhere.

[@ultrazorg]

the game might look bad but the corrupted music sounds cool

[@cr1901]

@bmecoli Right, I didn't word my question accurately. This may be one of the only times I can think of that it's actually a GOOD idea to edit the stack while in an interrupt :P.

[@BradCorrupts]

Megadrive games have a checksum, that's why. You either have to fix the checksum yourself or configure your emulator to do it for you. (also, it's easier to crash the CPU, so coding something to circumvent that is always a good idea.)

[@BradCorrupts]

@cr1901 Pretty much, but I had to edit the value in the stack, then rte back into the routine.

[@BradCorrupts]

...yes. (but then again, I'm almost 30, so I grew up with the classics, so slight nostalgic bias here)

[@PaintraSeaPea]

Better than Generations? Colors?

[@cr1901]

@bmecoli So, you essentially wrote an ISR that increments the program counter by 2 bytes every time the 68000 triggers an exception?

[@13thFlProductions]

Interation 4: Game works almost fine but no music and when you enter the special stage the game freezes for a second or two, No sound in the special stage, Special stage glitches up after the first part, Ring happens after Special stage, No other sound, Stages glitch up, No ground in water in Act 2

[@BradCorrupts]

>welcome to my very first 16-bit ROM corruption of Sonic the Hedgehog 2! (from the description)

[@andymate2006]

Wow Sonic has a serious gambling problem in Casino Nighy Zone. Lol.

[@DeoxysAndMew]

Heh oddly enough that painted smudge on the screen in the video makes it more kinda corrupted looking :P

[@BradCorrupts]

I have no plans to corrupt any 16 bit games in the near future, sorry.

[@sergiofls7623]

0:56 The music likes sonic 2 ld. (An SMS Rom Hack)

[@SwordFurb]

2:32 Sonic and Tails are running towards a glitchy vortex. Nice corruption anyways! :D

[@MegAmi24]

9:58 Best Emerald Hill Zone Remix ever made.

[@sqQueebble]

this is actually better than most recent sonic games

[@SuperKirbylover]

Iteration 9's Casino Night is just... creepy o_o

[@DoctorMelon]

3:00 - the best intro sequence EVER

[@TuxerTuxar]

3:00

[@TechnoTranceBrony]

I use Fusion. Might be an older version though. I found a checksum fixer that I'll use until I can find the option.

[@trailwaver404]

17:18 creepy as hell!!! if that shit played on my genesis if it corrupted I'm out 😰😵

[@theubercannon]

Meanwhile, in Iteration 5, Sonic and Tails enter the alternate universe.

[@CherryPixelBun]

This was Sonic Team's motivational poster circa 2006.

[@XaneMyers]

@bmecoli Cool. Also, this one was cool. There should be more Sonic corruption videos on KZbin by more people!

[@hyperhedgehog7]

sounds cool at some parts I wish I could that music without extra sounds

[@BradCorrupts]

@XaneCorpProductions I could possibly release both, maybe.

[@TechnoTranceBrony]

I got a nice effect corrupting Sonic 1. I did something to the level loading code, it seems. Somewhere between $30000 and $37000. It takes the game 6 minutes to load Marble Zone Act 1, and it still doesn't get the graphics right!

[@kelleysanders6396]

10:01 sounds like somebody's sledding their fingers with a guitar

[@kelleysanders6396]

Who has a electric guitar in a Sonic game a hard core Rock fan of course lols

[@kouichi_potato]

Sonic The Hedgehog 2 (2-bits)

[@PlacePlacington]

The third iteration was lovely.

[@64BitLuna]

I saw very little sprites in some places that were seen in the nick arcade prototype here O_o

[@seba83888]

10:58 ¿Knucles? que hace knucles en sonic 2 todavia no habia exisitido (no havia sido diseñado aun)

[@HHog]

12:15 "We're allright down here, don't worry!"

[@TuxerTuxar]

12:15

[@CheddarVG]

Why is the intro to Iteration 3 so good?

[@BradCorrupts]

Pure dumb luck, haha. Okay and a bit of deliberate tweaks to the rom to ignore error handling.

[@1Samario1]

Iteration 1: Welcome to Sonic '06 on Sega Mega Drive/Genesis!

[@SUNKENSATURN]

(if you would like too) maybe you can do one on the metal sonic version to see if its different or not

[@vgenisis]

I think it's Crying

[@TechnoTranceBrony]

I wonder how I could get a hold of this script. The emulator I use doesn't seem to fix the checksum on its own.

[@AceyMari]

9:54 feels like a new sonic.exe being made with the werid glitches 0.0

[@BradCorrupts]

Well, to be fair, they update the total views at fixed intervals, so the chances of you being the 2,300th viewer are actually relatively slim. However, I do appreciate you taking the time to watch my video, so thank you! Be sure to subscribe!

[@Killerthealmighty]

iteration 5 : you are not safe from the shadows.

[@Strakester]

17:00 Suddenly we're playing Ecco the Dolphin.

[@sarasparks4489]

Can you please post instructions for the exception bypass?

[@HHog]

21:00 Freaky, that's -exactly- how the Egg Prison looks in Debug mode when you place it anywhere before the end of the level. o_O

[@ExtremeWreck]

I saw it multiple times while using debug mode. It looks pretty funky IMO.

[@BradCorrupts]

It's not that easy. See, what I use isn't a program, but a script that I program myself. In order to use it, you must have an intimate knowledge of Python, hexadecimal, and ROM structure to produce the types of corruptions I make. Not only that, but for Genesis games, I use a crude hack to reduce crashing in games, so you'd have to know how to implement that as well. It's all pretty complex stuff.

[@SuperKirbylover]

17:05 Sounds like some creepy song... it reminds me of Sonic.exe.

[@sqQueebble]

gotta love the techno in iteration 6

[@IDGCaptainRussia]

17:10 the music sounds pretty good for corrupted music

[@TuxerTuxar]

17:10

[@IDGCaptainRussia]

@@TuxerTuxar wow way to bring back a blast from the past!

[@chaseman94]

I'd never thought a sega genesis game could glitch like an Nes game. I seen a Playstation 3 game glitch like one at random while I was playing.

[@BradCorrupts]

***** uuuuh, no. I use my own tools. All these corruptions were made with my own handwritten scripts.

[@BradCorrupts]

***** it doesn't do what I want it to do, which is why I wrote my own, as no corrupting program did what I wanted.

[@Cyberdoge]

pretty good remixes

[@TelaniGrey]

Holy crap HOW do you do this is the real question... YOU, SIR, ARE WORTHY OF ZE CORRUPTOR'S CAKE

[@mudkip9531]

How did a rom corruption break the sound layering? I'm curious.

[@BradCorrupts]

I mean a corruption will break just about anything in the game, but I think the reason for your question is you think that the music is pre-recorded. While true in most modern systems, early consoles had special synthesizer chips that generated the sounds and music in the game, so much like everything else all the Sonic music is essentially code.

[@glitchingman9945]

Which Corrupter Is The Best?

[@Armystuntman]

Wow, goes to show some games would suck without any music.

[@BradCorrupts]

Still better than any Sonic game made after 1994.

[@797gaming]

16:52 Tails died. R.I.P

[@gabrielbicudo512]

4:53 7:58 R.I.P Gabriela Laís Fernandes Fanscisca

[@MegAmi24]

THROUGH 1 Yep, (blank name) did through 1.

[@BradCorrupts]

entertainment, sorta like when you put random game genie codes in a game just to watch how hilariously bad it would break.

[@ExtremeWreck]

Ahhh yes, Game Genie, A.K.A. how to get infinite lives.

[@SammyRenard]

I wonder what would happen if you ran an uncorrupted modified rom of sonic 1 so that it ignores fatal errors like the game crash when you finish labyrinth zone 1 or 2 (don't remember which) while rolling, the screen scrolls down and for whatever reason it crashes the game on an illegal address error

[@BradCorrupts]

everett1911 really depends on what caused the exception. May continue like it was nothing, maybe some weirdness, or it would up and hang. I'd have to find documentation on the bug.

[@GasterBlasterMaster21]

Actually, you can bypass illegal instructions manually in sonic 1, though most of the time it would lead to another illegal instruction, or a lock up. You just need to press "C" to bypass them, though it can really be boring if you keep pressing C all the time trying to bypass those illegal instructions. An easy solution for me is to have an automatic key presser because holding C is not that boring. Of course the other, much more complex solution is by ASM Hacking to make sure it automatically bypasses it for you. It won't work on any other games, only sonic 1.

[@BradCorrupts]

To be honest, I don't use any of the ones out there, so I don't know. I programmed my own.

[@icyyfire8528]

Principal sonic 2 has some sprites from nick arcade prototype in its sprite stuff

[@FurbyGaming125]

5:17 No Music

[@BradCorrupts]

Yep, that's what happens when you completely break the sound driver.

[@13thFlProductions]

Interation 5: Most NPCs turn black, lopteloops are unpassable, no exit

[@hoodoo456]

May I have a download link to the corrupting tool you made for these? I'd be curious to try my hand at corrupting some roms.

[@Pyrocitor]

Anyone else got a greeny-brown mess stuck over the video from about half way in?

[@BradCorrupts]

This is a known issue that just cropped up a few weeks ago. Not sure the best way of fixing it yet.

[@Ranken]

ohh okay so its not just me!