Sonic The hedgehog 2/ Nick Arcade Prototype (Genisis/Mega Drive)

Sonic the Hedgehog 2 (Nick Arcade prototype) - Sonic Retro

The Nick Arcade Prototype is the most well known earliest prototype of sonic 2. It Got it's name As it appeared in 2 episodes of the nick arcade show. It uses several Sonic 1 assets, Like Music, Level Select, ect., Proving that sonic 2 was made from sonic 1.

General differences

If sonic crashes into a wall at a high speed rate, then he'll bounce off, land on his hands and feet and will Get up. These sprites Can also be found in the files of the simon wai prototype. This sprite was however, removed shortly after the nick arcade build, Most likely due to the fact that it was so annoying, That players demanded it for it to be removed.

Sonic and tails both have Different designs on the flag post, Though Eggman's was the only one to remain like that.

The Backgrounds of marble and scrap brain don't move.

Green Hill zone

This is the only zone to actually be from sonic 1.

Due to collision differences between Sonic 1 & 2, This zone has broken collision and glitchy graphics. Although there is a way to fix the collision, This will result in the rest of the zones to have broken collision.

The crab badniks have two unused sprites from sonic 1. These sprites also appear on eggman's face in the end of act 3.

If you manage to survive all 3 acts, then you'll be transported to marble zone; Along with the glitchy ring sprites.

Marble zone (Chemical plant)

An early version of Chemical plant.

The background uses a pink palette instead of a green one.

Although acts 2 & 3 use the same layout as act one, But use the same ring and object layout as Green hill act 1.

There is a boss that can be hacked in, though the boss file has been deleted.

eggman has an unused sprite where he accidentally drops the blue goo himself.

Spring yard (Hidden palace)

This is the only zone to not appear in the final game.

There is a master emerald found at one point, as well as the infamous tails moniter.

The last 2 acts have the duo stuck in a wall, having them use debug mode toescape, only to find out that the acts have no objects, rings or enemies.

In the debug menu, there are glitchy sprites that can be fixed with a pro action replay code, reaveling the crocodile, silver fish, and steptor badniks.

If you stay underwater until the drowning theme begins, jump out, and labrinth music will play.

in act 3, Water randomly raises and falls, and the boss music plays at one point, Even though there is no boss. the game will eventually crash afterwards.

Labrinth zone

This level is empty, using labrinth's rippling effect, chemical plant tiles and marbles ring layout.

If you have used a game genie code to fix the collision for green hill, then the zones layout will be mostly fixed, with it having the same chemical plant layout, but with broken collision. Just like hidden palace, the boss music will play if you go very far to the right in act 3, even though there is no boss. Star Light (Emerald Hill) This is the only zone of the following: 1: the only zone that is playable without the level select cheat code. 2: the only zone to be fully finished. 3: the only zone to have a sonic 2 boss. There is a snail badnik that was later replaced with the monkey badnik. The bee badnik has a different face design, and its shots rareley damages sonic. For some reason, tails doesn't appear in this zone. this may be due to the fact that when he gets hit, he'll make the player lose rings, And that the zone was featured in one of the nick arcade episodes where a girl's task was to collect 25 rings under 30 seconds, And it's obvious that they removed tails to avoid having him make the player lose rings while the player was doing his task. But tails is still accesible via 2-player in this zone, though. Act 3 is not playable, as it is the only act in this zone that must be played with a level select hack. once having accessed the act, you will notice that act 3 has no objects or rings, and is impossible to complete. it also misses lower bounds and has the same layout as act 1. In the debug menu, the see-saw from hill top is found and uses the emerald hill art. Scrap brain (Hill Top)

This is an early version of hill top.

The lifts don't drop once they come to a stop.

The lava doesn't harm sonic or tails.

The glowing eyed sprites found on the teeter totters were replaced with green balls.

In act 1, when you're about to complete the act, you die when you slide in the final tunnel. this is due to the sonic 1's SBZ act 1 for this version not being changed. using a pro action replay code, you will access the lower bound, but it has no sign post.

In act 2, it is unplayable without debug mode. The game will crash at a random point, due to sonic not completing it with an art cue in the way. removing the art cue will let sonic go farther into the act. Tails is able to complete the level without removing the art cue, which will trigger both tails and sonic to fall and get teleported to act 3.

Act 3 is basicly act 4 of labrinth, But using debug mode, you can get to the top right corner of the zone and will eventually get sent to the final zone.

Final zone

It teleports sonic and tails into the part in act 1 that must be seen via pro action game code. If you jump to the left you'll get into a pit and get stuck. if you attempt to walk to the right, it will crash to a pink screen, due to the game trying to access the final zone boss data that was deleted earlier. if you manage to Hack out the crash, then you will get to explore the rest of the unseen layout of act 1, but you will come to an edge of death.

Ending If you sucessfully beat the final zone boss after hacking him in, you will be sent to the ending scene, which consists of green hill's tiles, chemical plants layout and final zones music. The zone can be hacked in with a pro action replay code.

Special Stage This zone uses the same sonic 1 special stage, but is unplayable, as it crashes after being chosen.

Cheat codes Level select: up, down x4, up, a, start. Debug mode: c x2, down x4, a+start Level select with debug mode: up, down x4, up, then let demo play play, c x2, down x4, a+start 2 player: on level select, press b+start at any act Restore green hill collision: Enter the following codes using game genie

AA1A- ceal

AA1A- ceft

AA2A- CEBO

AA2A- CEB0

This will restore the sonic 1 collision, which means the collision for the sonic 2 zones (chemical plant, hidden palace, emerald hill, hill top) will be broken completely.

Restore hidden palace debug menu graphics

Using a pro action replay code, press 01C1D8:0007

This will restore the graphics of the Gator, the steplos, and the Bfish badniks.

Access ending scene

With pro action replay code, press FFFE10:0600.

Videos

https://youtu.be/epXGTgcufIw

https://youtu.be/mayeKw2HDzY

https://youtu.be/epXGTgcufIw

https://youtu.be/hQX0_o73MFU

https://youtu.be/lGsJjjziz50

https://youtu.be/GfTNv_xqBzg

https://youtu.be/SG1AKn2NDMs

https://youtu.be/5J6YdO9LTYIhttps://youtu.be/5J6YdO9LTYIhttps://youtu.be/5J6YdO9LTYI