A side-scrolling Sonic the Hedgehog platformer
's NeoGeo Pocket Color, released late 1999-early 2000. The level art and setpieces are mostly based on the Genesis
version of Sonic the Hedgehog 2
, while the music is primarily taken from Sonic the Hedgehog 3 and Sonic & Knuckles
It was developed by Dimps, who would go on to develop other games starring Sega
's prickly little mascot, such as the Advance
trilogy, the Rush
titles, the PS2
versions of Sonic Unleashed
, Sonic the Hedgehog 4
, the DS version
of Sonic Colors
and the 3DS version
of Sonic Generations
- Alliterative Name: Cosmic Casino.
- Art Shift: In Gigantic Angel Zone, Eggman starts using his modern clothing. 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.
- Guide Dang It: There are only six Special Stages in the game and seven Chaos Emeralds, so only the first six can be obtained during normal play. The seventh Emerald (the one that Robotnik stole from Knuckles in Aquatic Relix Zone) is used by Robotnik in the Last Utopia Zone boss battle. However, you can jump on the Emerald during the fight and after hitting it enough times it will drop and you can collect it. The game doesn't tell you this. This is necessary to access Chaotic Space Zone.
- Let's You and Him Fight: Seems Knuckles won't give Sonic his Chaos Emerald without having a little brawl first...
- Megaton Punch: How Knuckles sends Sonic to Sky Chase Zone.
- Nostalgia Level: This game is made entirely of Nostalgia Levels. Particularly interesting in this regard are Neo South Island Zone and Gigantic Angel Zone, which are pretending to be different Nostalgia Levels—Neo South Island is Emerald Hill disguised as Green Hill, and Gigantic Angel is Metropolis dressed up to resemble Scrap Brain.
- Recurring Boss: The "Egg Hammer Tank" from the Advance series first appeared here. Some other boss concepts are also reused in the Advance series, not to mention that you'll fight Knuckles and Silver Sonic during the game - Silver Sonic having Mecha Sonic's moveset.
- Soundtrack Dissonance: The musical choices start to get a little off in terms of appropriateness following Cosmic Casino Zone, such as placing the jumpy Mushroom Hill BGM (Act 1 to be precise) from S&K in act 1 of Aquatic Relix, which is modeled after the not so jumpy Aquatic Ruin Zone from Sonic 2. The most egregious instance of this trope, however, must go to the final boss battle, where the tranquil Sky Sanctuary BGM (also from S&K) makes the epic showdown with Eggman a little less epic (unlike the rest of the game, which takes inspiration from Sonic 2, the final boss is a spin on the Doomsday Zone from S&K and Sky Sanctuary's theme is not what one would expect for a final struggle above the Earth's atmosphere).
- Super Title 64 Advance: One of a number of games for this system with the word "Pocket" in the title.
- Villains Want Mercy: Dr. Eggman in the normal ending. Sonic then crushes his Eggmobile.