Collection Sidequest: There are a series of 96 puzzle pieces scattered around the game.

Casino Park: Cosmic Casino Zone, which is based on Casino Night but without the enemies.

Ian Flynn would eventually confirm that the game is non-canon on the BumbleKast (June 26, 2023), and mention it owes to legal issues on Twitter. To put this into perspective, even Sonic Chronicles, itself removed from canon due to legal issues, still got mentioned in the book.

Canon Discontinuity: While it's certainly not the only Sonic game to be this, this seems to have been hit the hardest by this, since Ian Flynn said he was barred from even mentioning the game in the official Encylo-speed-ia for undisclosed legal reasons.

They're accessed via giant rings at the end of each first act that spawn if you have 50 rings on, as in Sonic 1.

Bonus Level: The half-pipe Special Stages from Sonic 2.When he starts the battle in his machine, he's suddenly in his classic clothes again, but then he runs off in his modern clothing once the battle is over. Robotnik starts using his modern clothing.

Art Shift: In Gigantic Angel Zone, Dr.

Airborne Aircraft Carrier: Aerobase Zone.

Presumably since it was developed by a different company (the previously-mentioned SNK) and due to legal issues.

Despite this, Sonic Pocket Adventure has never seen an official re-release on newer platforms. Often considered one of the best Neo Geo Pocket titles, and to many fans, Sonic the Hedgehog's best handheld game of the 8-16 bit era, especially following the poor reception to Sonic Blast and the version of Sonic Jam a few years prior. Dimps went on to develop games starring Sega's prickly little mascot, such as the Advance trilogy (the first of which has several nods towards this game), Sonic Rush and Rush Adventure, the Wii/ PS2 versions of Sonic Unleashed, Sonic the Hedgehog 4, the DS version of Sonic Colors and the 3DS versions of Sonic Generations and Sonic Lost World. It was developed by SNK (who were also responsible for creating the Neo Geo Pocket Color itself), including people who would later establish the company Dimps. The level art and setpieces are mostly based on the Genesis version of Sonic the Hedgehog 2, the music is primarily taken from Sonic the Hedgehog 3 and Sonic & Knuckles, and the art style is based off the then-new Sonic Adventure. Sonic the Hedgehog Pocket Adventure, or just Sonic Pocket Adventure, is a side-scrolling Sonic the Hedgehog platformer for the Neo Geo Pocket Color, released late 1999-early 2000.

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