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This is a sub-page of Proto:Sonic & Knuckles/Sonic & Knuckles 0608.

One of the last of the prototype builds of Sonic & Knuckles, being dated about a week from completion.

General#

The bugged Sonic & Knuckles fade-in is still present.
The level select can not be accessed unless Sonic 3 is locked-on, which also uses the original Sonic 3 level select code (though here, it can be inputted at anytime, meaning it's much easier).
Pressing A with Debug Mode still functions like how it did in Sonic 3, taking you to the level select instead of the title screen.
Title cards still say SONIC 3.
The satellite at the end of Mushroom Hill Zone Act 2 can take hits while it is playing its "destroyed" animation. These extra hits are considered hits on the boss itself.
Sonic's/Tails' ending has a bugged fade-in.

(Source: Sonic Retro, Original TCRF Research)

The Screw Mobile's twister in Act 2 still glitches out Super/Hyper forms like it did in Sonic 3 Alone.

The Act 1 miniboss crash glitch achieved by beating boss with player 2 off-screen can still be achieved; in the final this was fixed by forcing the camera to scroll to where Act 2's layout loads.

Tails no longer has issues with the snowboard at the beginning of Act 1 overwriting his graphics.

During the Act 2 boss, the boss theme restarts when the actual boss fight takes place.
After beating the Act 2 boss, the lava doesn't cooldown until the results have finished; in addition, the normal level theme doesn't play.

Beating Knuckles will continue his song until the cutscene plays, while in the final beating Knuckles will replay the Hidden Palace theme, then play the miniboss theme.

Blue Spheres has been worked on slightly since the previous build:

Locking on Sonic 1 still brings the faded screen and there isn't any button inputs to unlock it, though this can be changed by using PAR code '''FFFFA1:0001'
Enabling Blue Spheres does not make the characters colored.
It is actually possible to select a stage at this point if you enter a special stage and enter this code : fff600:3000 ( Blue Spheres minigame results ) and disable it after the Blue Spheres minigame results screen appears , and stages are listed with 10 digits instead of 12.