[Open Assets] Sonic Adventure DX (Legacy) v3.1.1b/v1.0.1.1a + v4 Lite

hi everyone. i have made the decision a few days ago to... cancel version 4 of the sonic adventure dx port. the reason for this is because i lost interest and motivation in working on it since june 2025 (albeit i still made some small amount of work on it occasionally until feb 2026). i want to make other kind of srb2 mods and not enhance others' old works. i've been working on some other srb2 mods that are smaller in scope but actually have my interest and motivation in developing it. plus, maybe i will make games in the future too. well, i've already done that, but all of the released ones are crappy scratch games LOL.

but that's not to say that v4 is not being released. infact, here it is, released, right now! well, i made a lite version of it that has sonic's story + amy's hot shelter, emerald shrine, mushroom hill and... the scrapped perfect chaos boss and map! let me note this: perfect chaos (both the boss and the map), sky deck, final egg, twinkle park (technically it is finished but i was working on enhancing it a bit) and emerald shrine are unfinished, but still beatable! additionally, some maps have been tweaked to be beatable with the 6 vanilla characters, and the character restrictions have been lifted. plus, emerald shrine has been converted to udmf, and the perfect chaos map has been tweaked to feature more balloons to compensate for the enlarged balloons being shrinked to 1. this was done to avoid any resynching in 2.2.15.

plus u can get emblems and get a special reward for it (spoiler: it's just pandora's box )! but yeah. at least you'll get something alright. an idea that has been floating around in my head while development was making a metal sonic story as a reward for getting all emblems. a specific arrangement of maps that are reversed, take at a different place in time and are harder. well, i never got to work on this but yeah.

i'll release the development files later someday

enjoy!

FUCK

- Fixed the campaign starting over after Final Egg. Now, you instead go to Hot Shelter and then the 2 bonus maps! That's how I intended it, but instead, you just went to Emerald Coast again. Now that's no longer the case!

There are no changes to base SADX itself, and won't be until V4 releases. Hopefully.
Speaking of that... here's a LOT of Version 4 previews attached to this post below!



Casinopolis, Windy Valley, Lost World (tho it's been done since a long while ago) and Mushroom Hill (one of the bonus maps) have been finalized, and Emerald Coast, Ice Cap, Sky Deck and Final Egg got some more changes too! Note: the Eggman statue in Casinopolis is supposed to be a golden statue, but it's only grey with models on... Damnit.

Speed Highway and Lost World (which, as I've said, is already finalized) won't get a lot of changes, aside from slopes. They already look great lol.

Twinkle Park didn't get much, I decided to bring back a bit of the current ugly version for now... I do have some ideas for em, though.

Red Mountain's skyboxscale has been adjusted and the skybox moves on the same speed with the stage. I still have to put slopes to the final section...

Additionally, you will have a NEW HUD!!! It's from TehRealSalt's SA1 HUD. I won't put that mod in here, but the graphics are here!

Also, the monitors in the stages are more varied now! You now have Pity Shields, Attraction Shields, Speed Sneakers, Force Shields, Whirlwind Shields Invincibilities too! Gotta go fast and blast through the enemies!



I hope you'll enjoy the final result! This was klasky, now gotta head back and work on the mod and wait for that blue speedy anime rat coming this month... Bye bye!

- Fixed Sonic's Final Egg's floor-lowering sector lowering a wall after the "kill all badniks" part
- Fixed Final Egg music change only happening once
- Added Pandora's Box (get all 32 emblems)
- Fixed Big's goalpost and life sprite
- Added a transformation sprite, a Game Over sprite and a Continues sprite for him
- Changed Big's Character Select menu background color
- Changed Big's Character Select text a bit again
- Made Tails' Sky Deck and Speed Highway easier
- Fixed non-functioning death pits in the Windy Valley tornado and also changed a ceiling texture
- Raised the ceilings of the FOFs around the 4 bridges in Tails' Windy Valley



Hi! Thank you for playing this mod, everyone! I would like to show you something about the future of this level pack...
The next update, v3.2 or v4 (idk how do I name it), will feature level design changes (such as Dust Devils in Windy Valley as a gimmick and balloons in Twinkle Park), slopes, a revamped Twinkle Park and Super Sonic's story (hopefully)! Maybe even a revamped Casinopolis too? I don't know.
For that epic battle, if you know how to code, please hit me up! I need you to make Sonic battle some giant ass water monster in Station Square. For the sprites, ummm... I don't really know what will I do about them. Maybe I'll use some custom sprites made by someone from Spriters' Resource or I'll render them out myself.
I also may make an update to the MP patch, which makes ALL stories available and modified for Multiplayer! But not now lol. For now, use the "map" command for it, if you can? Idk if the game does allow it.
This was klasky. Thanks for reading and have a good day (or night), bye bye!

I've decided to do a few more tweaks. This update is smaller than the last one. Nothing really major... Well, aside from the first three and one of the Tails emblem hints mentioning checkpoints when they're no longer in the maps.

- Fixed Final Egg teleporter not working in Multiplayer
- Fixed Red Mountain music not changing back if you died in the volcano
- Fixed Windy Valley music change only working once (MP patch)
- Fixed Windy Valley music improperly looping (thanks, Troplucky!). It also became smaller in size
- Changed some textures in said stage
- Added tutorial prompt for Big when starting his story (so, Twinkle Park)
- To accomodate for this, the red crawlas at the start have been replaced with blue ones
- Fixed HOM in Red Mountain volcano
- Changed Big's Character Select text a bit
- Fixed a misaligned texture in Sonic's Twinkle Park
- Changed some emblem hints

Thank you all for playing! And thank you for 1000 downloads! That was really fast man. I hope you'll have a good day! Good day and... well, good night (it's night for me at this time)!

- Fixed Final Egg teleporter destination killing you
- Added it in Amy's Final Egg for consistency
- Made every Starpost Activator have only one Starpost, this fixes them looking incorrect in Multiplayer if you're not the host
- Made the last Final Egg Starpost face correctly
- Removed restart button in Casinopolis (MP patch)
- Fixed beating the Metal Sonic boss not ending the level in Tails' story
- You now start said boss with 10 rings too
- Fixed not getting the tornado skybox, music and sky in Windy Valley (MP patch)
- Added the 2 red springs at the Speed Highway emblem (this was not present in the MP patch previously, but it is now)
- Made the crumbling platforms respawn in Sky Deck
- Removed some Lance-a-bots at the checkpoints in Amy's Hot Shelter
- Made one more sector trigger teleporting in one of the bonus maps

...Sorry 'bout that, guys. God damnit. I should have playtested this a bit more... But anyway, here you go!