Aight, I promised it and here it finally is.

Keep in mind that this version of the game will not be developed any further in favor of a new version being developed in a new engine.

This build of the game is separate from the main game, as such it's available as a separate download and the prior full version remains online.

Saving is disabled in this build to avoid potential issues.

Expect bugs and glitches. This IS just an unfinished build gone public, after all.

Potential Questions and their answers about this build

Q: So is this it for MYSTERYTALE Online?
A: Far from it, plans have just changed a little and I've grown tired of working on the current outdated code. That said, MYSTERYTALE Online will be more of a side mode in the future and may adopt a Peer-to-peer type of multiplayer instead. All this really means is that there's an actual game to play right next to it and that you and your friends maybe be able to play in private servers and private lobbies. Also that you probably won't have to fear about server shutdowns killing the multiplayer altogether.

Q: Will my Save Data carry over into the new version?
A: Your 0.12.2 Save Data will carry over into this BETA, but not into the new version being developed in a new engine. That said, is there really much to lose other than maybe playtime?

Q: What's in the build?
A: Check out the below Devlog.

Q: Will [X] thing be in the new game?
A: I'd much rather answer questions about the new game in a separate devlog, or, I dunno, the comments or something. However, plans are to include the majority of content from the GMS1.4 version of MTO, such as its chat system, PvP System, maps, skins and even its scrapped Racing Mini-Game (that was scrapped for being absolutely terribly made).

Q: Sans PvP?
A: Uh, technically. Unfortunately he only has, like, one finished spell and it's pretty basic. I could've probably half-assed a basic Gaster Blaster spell for the public build, but... nah. Outside of a lacking moveset though, Sans should be mostly functional.

Q: Can we have the source code?
A: Imma be real with you on this one. I don't think you want it. It's trash. That's, like, the main reason I started work on a new engine. It's awful to work with. I can't believe I once put someone through the agony of trying to help me with this mess of a source code. So, uh, yeah, no, you don't want it. But, uh, as a consolation prize, I suppose I could show off some progress on that new thing soon.

Q: But I really want the source code!
A: Look, whatever you do, I just ask that you don't mess up the experience for anyone else playing.

Q: How do you get Super Sonic?
A: You don't. Super Sonic hasn't been in the game for, like, years.

(Incomplete) Changelog between 0.12.1 and this BUILD:

Changes:

• Fixed the game running at, like, half of its intended speed (GMS1.4 Jank)

• Added a new Guide Function to the CELL Phone! Check there for any questions you may have!

• You can now chat while a taunt is active

• Added... something to Toriel's Basement (Unfinished)

• Added a brand-new custom Log-In Screen has been added based on the intro sequence of DELTARUNE

• Partial Controller Support! Some displays may be bugged with a controller plugged in and SPELLs cannot be controlled with them, but it's here

• The Chat Cooldown System was removed

• You can now customize the color of your SOUL (when playing as a monster) once again! This feature was absent for a few versions because of... what reason?

• You can now further customize how usernames are displayed!

• A proper settings menu has been added to the load menu and your CELL phone

• Battling players now appear visible on the overworld

• The Shop System has been rewritten and Sans' Old Shop has been re-opened for business! Head on over to Snowdin and check it out!

• Zacharie makes his return as an alternate shopkeeper for Batter and Judge! Even I have no idea what the lore behind him being here is

• Morshu appears as an alternate shopkeeper for Link

• Re-Added Lemonade

• Blue Soul Mode was rewritten to be more UT-Accurate

• Random Encounters are now more common while running

• Rewrote internal logic for all your murder spree needs

• Rewrote Overworld Menu

• Rewrote File Loading Menu

• Rewrote File Saving Menu

• Enemies of the same type now display letters at the end of their name

• Admin Stuff

• Other Stuff

Skins:

• Added Dapper Blook

• Added Napstablook with Headphones

• Added Mad Dummy

• Added Small Bird

• Added Jogboy Papyrus

• Added Spamton G. Spamton

• Added Omori and Sunny (Omori)

• Added Isabelle (Animal Crossing)

• Added DIO (JoJo's Bizarre Adventure)

• Added UNFINISHED Save Frog (Mother 3)

• Updated Bugerpant

• Updated Bandana Dee (Kirby)

• Updated Jotaro Portraits (JoJo's Bizarre Adventure)

• Mettaton's Dialogue now has a "laggy" effect like the original game

• Sans X now has regular Sans' taunts. Cool, I guess?

• Madotsuki now has her old taunt again

• Dark World Kris now has a skin select icon

• Monster Kid now has a portrait

• Asriel now has a taunt

• Flowey now has taunts

• Toriel and her teacher outfit now have taunts

• Cool Dude Papyrus now has a skin select icon

• Temmies now have taunts

• Rockington now has a skin select icon and a portrait

• Rockington doesn't have a taunt now. Do not try resetting your game several times to see if you have the right FUN value to use it

• Cap / Deltarune Temmie Skin Select Icon

• Mettaton Portraits and Skin Select Icon

• Re-Added Jotaro Taunt

• The Batter and The Judge can now purify the Ruins

• More Stuff

PvP:

• Skins without SPELLs have been banned from competitive PvP. They remain usable in immersive PvP, however

• Position of enemy soul is shifted around a bit based on ping

• Rebalanced Stats in Competitive PvP

• Added Mad Dummy

• Jotaro PvP Compatibility

• Added DIO

• UNFINISHED Sans PvP Compatibility

• UNFINISHED Swapyrus PvP Compatibility

• Undyne PvP Compatibility (Buggy)

• PvP Invitation Menu has seen some improvements. Most notably, it now lists the differences between Immersive and Competitive Modes

• Sped up size-changing of Papyrus' Ceiling Bones

• Papyrus' Slow Bone Wave's Cooldown Incresed

• Papyrus' Really Cool Regular Attack is now only usable once per battle, even if the user recovers TP

• Papyrus' Slow Dual Bones have an increased cooldown now

• Buffed Rockington

• Changed default PvP Battle Theme

• Changed Chara's PvP Battle Theme

• Added PvP Sprites for Garfield, Roulxs Kaard, Dark World Kris, Monster Kid

• Added number display for enemy healing HP or TP

• Also other stuff

Fixes / Adjustments:

• Fixed an oversight where Temmie and Mettaton didn't use their correct typing sounds during intro sequence

• Made the Ronaldhino Soccer title screen appear less frequently

• Fixed an oversight where invisible admins would appear on the battle screen sometimes

• Adjusted some maps slightly for accuracy

• Fixed various Map Transitions sticking players into walls. I thought they'd line up better, whoops

• Fixed various Sprite offsets

• Fixed an issue with Frisk's portraits

• Fixed character animations being sped up during PvP Chat preview

• Fixed an encounter formation going unused

• Chat now only lets you type valid characters

• Adjusted Game Over animation

• When in battle, messages from players in the same room now get added to your chat history

• Updated Splash Screen

• Adjusted some fonts

• Updated Title Screen

• Updated some music

• Misc Fixes

Misc:

• Updated localization files GameMaker Server

• A bunch of other stuff I didn't keep track of

• Misc misc Stuff