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Top 5 Sega Genesis / Mega Drive

Adventure, Action, March 25, 2017
Somari is a pirate version of Sega's flagship video game Sonic the Hedgehog produced for the Famicom by Hummer Team in 1994. It was sold primarily around Hong Kong. The game is notable in the fact that it contains a vaguely accurate simulation of Sonic the Hedgehog, a 16-bit game produced for the Sega Genesis, on an 8-bit cartridge - something thought impossible by many video game experts at the time. The game features a character named "Somari" - Nintendo mascot Mario wearing Miles "Tails" Prower's trademark shoes, as well as possessing Sonic the Hedgehog's abilities.

Video game enthusiasts have suggested the possibility of reverse engineering or the possession of Sonic the Hedgehog's source code in explaining Somari's creation. It is also estimated that the game devolopment started in late 1993 and came out in early 1994, as Somari has abilities only available in the game Sonic the Hedgehog 2, such as the Spin Dash, opening possibility that it contains coding information from that game as well. However, these concepts are merely speculative, as it is unknown exactly how, when, or where this game was created.

As with many independently produced pirated games, the coding is flawed. Somari's physics can make completing the game more of a challenge, certain areas have numerous glitches, and access to certain levels requires the use of special computer programs. There is no ending sequence of Somari running through a previous level, instead there is a single screen showing Robotnik juggling the Chaos Emeralds with some text on the screen claiming Robotnik will return.

Being a pirate game, it was probably released in fairly limited numbers, and only in Asian countries. The game has become more well known recently through the phenomenon of console emulation.
Adventure, Action, Race, March 27, 2017
Metal Sonic Hyperdrive is a heavy modification of Sonic the Hedgehog (1991) by Darkon360/Lone Devil for the Sega Genesis. with brand new Zones, Sonic CD style gameplay, music, playable characters, and gameplay modes. Starring Metal Sonic, taking Sonic's role as the main protagonist to stop Dr'Robotnik's greatest inventions yet. Also starring special guests such as Kirby, and Somari.

One day, after the defeat of Dr'Robotnik at the hands of Sonic, Robotnik decided to rebuild Eggrobo to travel Mobius to search for the Chaos Emeralds. Eggrobo kidnapped Tails in the Mystic Ruins by sending him into Metallic Madness, but luckily, Tails escaped. He decided to sneak into Robotnik's lab and grab the parts of his robots and pieces. Tails later went to his home in the Mystic Ruins and created a new robot, based off Metal Sonic's classic model, Codename: METAL, with the ability to feel and behave almost exactly like Sonic. Tails was able to track Eggrobo to where he's heading by using his radar, so Tails sent Metal Sonic to Robotic Isle, where Eggrobo was heading to, in hopes to find the Chaos Emeralds and destroy Dr'Eggman's plans once and for all.
Action, March 27, 2017
Amy Rose in Sonic the Hedgehog 2 (aka Amy in Sonic 2) is a character swap hack Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis, with character Amy Rose as playable character in place of Sonic the Hedgehog. The game's sprites (modified from Sonic CD) use Amy's initial design prior to Sonic Adventure.
Adventure, Action, Race, March 27, 2017
Knuckles in Sonic 2 is the resulting game when Sonic the Hedgehog 2 is locked onto Sonic & Knuckles with its passthrough port. Sonic is replaced by Knuckles and Tails is not playable whatsoever. The title screen features Knuckles also but removes the two player mode and options selections from it. This game is identical to Sonic 2 (aside from a few changes to make it more playable with Knuckles) but with Knuckles now playable instead of Sonic or Tails.

Sega, though adjusting Knuckles' physics to match those of Sonic & Knuckles in-game, ran into issues with those same physics in the Sonic the Hedgehog 2 pre-game demos. A fix was created to keep Knuckles' jump height consistent with that of the jump height from Sonic & Knuckles but also make the demos function properly. Knuckles' jump was modified so that it reached the same height as Sonic would reach in Sonic the Hedgehog 2, but his mid-air mobility was slowed to give the gimped feeling his jumps had in Sonic & Knuckles. This fix corrected most of these issues; however, the mid-air speed cap caused Emerald Hill and Aquatic Ruin Zone's demos to be left in a sub par state.

Six prototypes were found by drx and were released (0524, 0606, 0608, 0610, 0612, and 0618).