For me, an expanded taste of Sonic 3's level order with day/night changes in every few zones. Its a 2D game.
Like this, the game starts in the morning in a tropical area:
Angel Beach Zone:
Sonic and Tails are on the wings of the Tornado in the mid-morning with Amy Rose as the pilot. Sonic jumps off and transforms to Super Sonic in an undisclosed island. Suddenly a mysterious Egg Robo figure glows green, similar to the Master Emerald, knocks Sonic off his super form. He finds out that this figure is a lot more dangerous than Knuckles when he approached the Floating Island, is shaped like EggRobo with his lazer gun. He then takes the 7 emeralds, puts it in the gun, and fires it randomly in the sky in different areas on the island, then flies away. Sonic and Tails then goes to explore, knowing that Eggman isn't far away from this.
Act 1: They are on the beach, and they are dodging robo crabs and piranhas fishes like Green Hill. Since it is morning, robo seagulls randomly drop bombs and wind currents sometimes blows water on Sonic and Tails; it is potentially dangerous if they have Lightning and Flame shields cause the waves will cause you to lose them. Special Stage giant rings are hidden in buried areas under the sand and a couple of underground places. Miniboss is a cobra-like badnik that digs in the sand and comes on top to breathe fire on you.
Act 2: Sonic and Tails further explore the beach and they now encounter random spikes and even quicksand. It is even more dangerous with palm trees dropping bomb coconuts (Like Mecha Green Hill in "Sonic Chaos"). Further along the act, a flying warship starts to drop bombs and fire and lazers, being controlled by the glowing EggRobo . Sonic and Tails then fights Eggman's first of many inventions in the game, which is a giant groundhog that digs and pops right out the ground; the best way for Sonic to damage it is the face when it pops off, but this is a very easy boss. After freeing the egg prisons with the animal friends (Blue Flickies and all), the EggRobo AND Nat the Weasel, together, shoot the guns into the ground from an above ledge, making Sonic and Tails fall down underground to a hidden city filled with water.
Water Temple Zone: 1 act underwater, second act controlling the water levels by switches, uncovering hidden water shields, extra lives, and plenty of ring boxes. Takes place in the Afternoon, but since its underwater, sunlight is hardly seen. Act 1 boss is a seal robot that just doesn't know how to behave. Destroy that to end act 1. Act 2 boss is Eggman again controlling a whale looking machine that attacks Sonic like Free Willy. lol.
Roman Gardens: Takes places in Late Afternoon/ early evening. Act 1 is clear skies with the icecap mountains in the background, but the zone itself is a bunch of rundown areas of an ancient civilization. Plenty of areas to explore and extremely hilly with loads of Big Ring Special Stages, hidden routes, shields, ring boxes, and other good ies. Also a great place for Tails to assist you. Act 1 also has an attack on the flying warship, similar to Angel Beach, with it attack even more aggressively, with the act 1 boss being an ancient Roman statue with shooting arrows. Act 2, however, starts with the sun start to get lower in the sky. As Sonic progresses through act 2, the sky starts to change orange and the sun gets wider and more explosive as it sets in the background. The boss battle is Eggman who starts to attack Sonic on the ground, and after 3 hits, he takes off airborne. Sonic and Tails suddenly sees Amy with the Tornado, and they board it and chases Eggman through the sunset sky, dodging his rockets. Then after freeing the eggprison, night falls and they see Eggman going to the next area-a flashy nighttime outdoor studio/ Carnival.
Party Night Zone: Tails assists Sonic off the Tornado that Amy is flying, then act 1 is a load of colors, filled with numerous nightlife activities, which many are crafted by Eggman. Tons of balloons, slot machines, gaming stations, prizes, and so on. Act 1 ends with the green glowing Eggrobo dropping off a box, that a robotic clown pops out of. The Clown looks like a creepy mixture of Eggman and The Joker as the act 1 boss. He breathes out deadly gas clouds and punching gloves, that you can deliver right back at him to damage him. Only 5 hits is needed to take him down. Act 2 is the same thing as Act 1, just a lot more hazardous with loads more traps. Act 2 boss is Eggman, with a bouncy ball, launches at Sonic and Tails and its controlled electronically. They key to destroying it is jumping through platforms to shut it down the machine to get a barrage of hits before it power itself back up again. Defeat it, and free the egg prison, and then the Master Emerald glowing Eggrobo with Nat the Weasel (flying with a rocket backpack), shoots a portal, launching Sonic and Tails way into the snow covered mountains.
Ice Blizzard Peaks Zone: Sonic and Tails start off with a snowboard chase where they start to run away from the Massive snowball that gets bigger and bigger as it goes down the hill. Eventually it goes to an underground cavern hidden under it and quickly keep moving to prevent Sonic from freezing to death. Fire shields will protect you from that and it can melt a lot of hidden ice passages to numerous goodies. Also these dark ice covered caverns hidden under the peaks is dark, and a fire shield will play as a lantern to guide you, since act 1 takes place at night. The act ends with a snowman robot that is mad and throws a machine gun worth of snowballs at you. It will run out, and only 4 hits of the spin attack will defeat it. Act 2 starts outside with the sun rising, and despite being daylight, you still have to go through a mini blizzard that pushes you back and slows down the speeding. A Spin Dash will do the trick. Act 2 ends with the beginning of the boss fight, with Eggman back turned against Sonic and Tails. He is typing something about certain plans of.....and then he pushes the computer that has the plans away, to start fighting with the Eggmobile shooting icicles and floating the sky with a sword looking icicle that Sonic has to dodge. After the boss fight and free yet another egg prison....Eggman abruptly dashes off to the right, but Nat the Weasel appears with the jetpack again. He doesn't do anything, but he flies away. Suddenly, the warship from Angel Beach and Roman Gardens appears again and Sonic with Tails run to the right. The problem is, the area they are running to, is the edge of the peak and nothing but a long drop off the Peaks is closeby. Out of desperation, Sonic and Tails knew that they had to board that warship; so they jumped on the ledge and grabbed a piece of the ship, but they had no idea that the ship itself was a revamped zone they boarded a long time ago...on the screen it displays:
SONIC AS BREACHED THE FLYING BATTERY!
SONIC HAS BREACHED THE FLYING BATTERY!