This will ensure values from $80 to $FC will multiply by 2 properly.īecause we changed that value from byte to word, we have caused a potential (and fatal) error that will cause the game to crash if a sprite map ID from $80 to $FC is set to show. $80 x $02 = $100, only the the right two digits are read $00). I'll comment all the news.What happens here is the map ID is loaded into d1 'move.b $1A(a0),d1', and it is then multiplied by 2 'add.b d1,d1', but this only multiplies a 'byte' of data, so map ID's higher than $7F won't multiply properly (e.g. Obviously, my first sprite isn't final, I have to fit it better because that width is the maximum I have to use for 'running' for example. Well, I'll respect the original sprite style. I know that one of the biggest sprite in this game is the 'breathing' sprite, so I have even a bigger problem, xD. I'm going to do it to every sprite of Sonic in the game. In this case, we have more pixels than the mapper memory (here we can see that the bank memory in the master system is bigger than the game gear version), so in this case the best thing we can do is to 'fit' the sprite:Īdapting the sprite, we have this result: The main problem is the size of the sprites. I have understood the structure of the sprites, and the mapping offsets, so for now, I have only 1 fixed sprite, but it's enough to show the project. The goal is to replicate the Sonic the Hedgehog's (Master System version) sprites in this horrible port. That thing is the group of horrible sprites in Sonic the Hedgehog (Game Gear version). This time I want to fix something that hurted my heart long time ago, xD. I'm entering in this amazing world of hacking SMS-GG roms. The final credits have my signature (BehindtheROTO is my most known nick, more than 'tailsnic') I have just discovered how to edit end credits in the Game Gear version (the offset is unknown). The ROM will be free to download, but I want my merit, xD. I have to see where to upload it to make sure that the people knows that I made the hack. I put english subtitles for you, because I'm from Spain, xD: Here I made a video showing how I did it and showing the differences. Sonic the Hedgehog Game Gear - SMS Style Edition. I'm glad to announce you the finished project. Last edited by tailsnic on Sun 10:17 am edited 6 times in total Sonic the Hedgehog Game Gear - SMS Style Edition Posted: Fri 12:01 am

Sonic 1 extended sprites