Sonic the Hedgehog 2 v0.9.9

Shadow's invincibility stars now use his verified Megamix donor palette, independently of the other player. This gives grey/white normal stars and follows his donor water/Super colours while preserving Sonic 2's native star art, animation, movement history and expiry. It does not introduce a guessed purple theme.

Knuckles' grey effects, the other characters' colours and existing world-monitor policy are preserved. Native and widescreen mixed-party checks cover both roles, water and fades. The previously missing twelve Amy/Knuckles and Amy/Shadow cases also pass, bringing the bounded character audit to 66 cells.

The package retains BATCHED rendering, native IPO/PGO, diagnostics, practice options and high-refresh presentation. ROMs/donor artwork are not included; native saves/settings are preserved.

The owner-deferred glide-jitter/party-slowdown and older unreproduced reports remain deferred. Exact interlaced title-card flicker still needs an identified REV01 NTSC-U hardware reference. No artificial emulator-specific flicker was added.

Fresh installs enable adaptive widescreen Fit to screen. Explicit saved aspect and mod choices take precedence when updating.