Big the Cat in Sonic the Hedgehog

By E-122-Psi

Big the Cat in Sonic the Hedgehog (aka Big in Sonic 1) is a character swap hack of the game Sonic the Hedgehog for the Sega Mega Drive, with character Big the Cat as playable character in place of Sonic the Hedgehog.

Big is slower and heavier than Sonic, but can use his bulk and fishing rod to breeze through areas. In addition, Froggy is hidden in every act besides Final Zone. Try and help Big find him.


  • Lure Attack: Hold A to aim lure, the longer you hold the further it will throw.
  • Body Slam: Hold Down and press B or C while jumping to slam down on anything under you.
  • Swim: Big will automatically float in water. Hold Down to sink.
  • Big can also smash walls just by running through them.


  • The lure can not touch certain objects offscreen.
  • On rare circumstances, the casting flag will not reset properly, disabling the move.
  • Some demos are not redone, resulting in off-sync behaviour.
  • Occasional odd behaviour when swimming, hold down to reset in such circumstances.

Special Thanks:To DeltaWooloo, HitaxasTV, CampbellSonic, D.A. Garden and many others on the Retro forum and Discord server.


File Type: 7z

File Size: 622.24 KB

dilworks @ 2021-10-11 12:59:41

Interesting new experience on vanilla S1 levels, which were designed for small and agile protagonists.

Big is none of those, but he can do it anyway - it takes time to get used to his unique moveset, and watch before you move!

On the flip side, this hack renewed my hate for Labyrinth Zone.

ItzGreenForever17 @ 2021-10-11 17:50:59

Very nice hack! I found a glitch though where if Big stands on an item monitor and rolls on it to obtain it, he walks in the air. Doesn't really mess with gameplay that much but I thought I should mention it and can lead to some funny things happening in the game.

EDIT: Nevermind, it can mess with your physics and it seems like the level collision breaks

Last modified by ItzGreenForever17 @ 2021-10-11 17:52:54

E-122-Psi @ 2021-10-14 07:14:03

Yeah, I've found this bug in some of my other hacks too. I should be able to fix it for next revision.

Jdpense @ 2021-10-12 07:09:15

I remembered playing this earlier on sometime this year, and I liked the idea of this hack. Although I don't have too much to say other than that. I guess I would suggest maybe adding the smoke dust when Big spindashes.

Last modified by Jdpense @ 2021-10-12 07:09:30