Sonic The Hedgehog: Ancient Isles

By Catswell

Aren't you tired of these hacks overwhelmed with new features that make you surprised every time? Are you want to just chill out in some simple atmosphere with new levels? Well, here you are!

Sonic The Hedgehog: Ancient Isles (formerly known as "Catswell's Edition") - is a hack that directed to create simple, chill yet fun and memorable experience with a whole bunch of absolutely new levels with drawn from scratch sprites.

Plot of hack is basically same as Sonic 1, it's just variation of "What if, events happened on another island?".

Gameplay also as Sonic 1, without spindash, so only thing you can use here is momentum. A lot of things in level design based on momentum basis. Master it and you can reach some heights on multiple paths. Also you can use Air Roll (press A/B/C in the air, while you are not jumping/rolling).

Hack is working on hardware! Tested on Sega Genesis VA6.5 with Mega Everdrive Pro. Not tested on other flash-cartridges, but it should work everywhere, I think.


  • Intro > orig: Owl City - When Can I See You Again?
  • Title Screen (Discovering Something New!) > by XBRO
  • Ancient Forest Act 1 (Here's The Start) > orig: Downtown Nekketsu Monogatari EX 2007 - Houryou theme
  • Ancient Forest Act 2 (Never Late To Be A Hero!) > by XBRO
  • Ancient Forest Act 3 (Night Is Calling) > orig: Adeq - Dance In The Universe
  • Buried Ship Act 1 (Forgotten Base) > by XBRO
  • Buried Ship Act 2 (Wild Jungle Woods) > by XBRO
  • Buried Ship Act 3 (Nature Works With Metal) > by XBRO
  • Stardream Oasis Act 1 (Dehydration Isn't An Option) > by XBRO
  • Stardream Oasis Act 2 (Drowning In Waves) > by XBRO
  • Stardream Oasis Act 3 (Night Diving) > by XBRO
  • Invisibility (You Can't Touch Me Now!) > by XBRO
  • Got Through (The Way Out) > orig: Bomberman Tournament - Finish Dungeon
  • Boss Theme (Maniac In Disguise) > by XBRO
  • Special Stage (Uncontrollable Gemstones) > orig: Bomberman Tournament - Overworld
  • Credits (Never Stopping) > by XBRO
  • TheBlad768 - main programming, feedback, testing (both emulator and hardware)
  • XBRO - music (both custom and ports)
  • stare (FlyTF) - helped me to understand basics at the start
  • Vladikcomper - original MegaPCM, Advanced Error Handler, palette changing guide, modified original disassembly (source code)
  • Hitaxas and ProjectFM - Splash Screen example/guide
  • flamewing - DMA Queue
  • Hivebrain, drx and Stealth - Original disassembly
  • mrcat-pixel, SomeRussianDude21, FoxConED, Papazakku and others - betatesting, feedback

File Type: 7z

File Size: 477.81 KB

Mohamad20ZX @ 2021-10-11 02:04:44

fantastic hack wish it has More badniks

goodegames @ 2021-10-11 20:47:27

An amazing rom hack with fun levels! I would highly recommend this and I cannot wait to see it's future!

dilworks @ 2021-10-12 19:53:26

Not bad, still needs a lot of work and polish but there is a solid base. The desert zone is a quite curious concept (until you read "Oasis" on the zone name, then it starts making sense... kinda). Also like the Scrap Brain vibes on Buried Ship.

Worth keeping an eye on this for future contests!

Jdpense @ 2021-10-12 22:32:11

I really loved art here! It's the best I've seen here so far!

Dima_Cool @ 2021-10-13 00:42:28

It was really cool! I enjoyed going through this hack. Thanks to all those who touched the creation, you are very cool!

FloppaTheCaracal @ 2021-10-13 11:16:52

It's pretty good actually. But I saw some bugs.

Nadevan @ 2021-10-15 01:31:16

Love the music choise! very nice entry man.

JefferyTheNotepad @ 2021-10-16 04:58:40

Comment deleted by JefferyTheNotepad @ 2021-10-16 05:03:26

JefferyTheNotepad @ 2021-10-16 05:03:35

To put it simply... this is literally just Sonic 1, but better.

I realised this during Buried Ship Zone, as I had noticed the Zone had all the slow pace and such that Marble Zone had, but just done in a much less sluggish way.

And in general this Hack just has a very charming style to it, as it sticks to the original visual design, gameplay and everything that Sonic 1 had, but just makes everything from beginning to end much more consistent and better.

Really liked it, I'll returning for next years...

Last modified by JefferyTheNotepad @ 2021-10-16 05:04:27

roadsterenjoyer @ 2021-10-29 14:54:34

after finishing this twice and making a new NEW account(because i forgot my old one) just to comment on this, job well done, i had a lot of fun in this, not the best hack ive played but i really quite liked it, the first zone reminded me a lot of pantufa though lmao, amazing level art too :D

EddyTF @ 2021-11-14 00:44:05

AWESOME!!! (Кэтс - просто шикарнейший хак):3

Rayon @ 2022-03-14 12:10:37

Great hack, waiting for the new version