Somari is a unlicensed version of Sonic the Hedgehog, which allows you to play as Mario with Sonic's Abilites.
The gameplay is similar to Sonic the Hedgehog, except that the physics are much more broken, and Scrap Brain Zone from Sonic the Hedgehog has been removed (although the level is still in the coding, although with glitched graphics, and uses tiles from both Star light Zone and Final Zone, and uses Star Light Zone's music.), many other things that were removed was, Final Zone's music (the boss music plays instead), Chaos emeralds can't be collected, and part of Sonic the Hedgehog's ending squence (the part where Sonic is in Green Hill Zone again) has also been removed.
There were many hacks of this game:
Sonic 3D Blast 5 Edit
Not to confused with the Game Boy game of the same name. This hack changes the playable character to Sonic, and unlike Somari, you start out in Spring Yard Zone in this hack.
Sonic and Knuckles 5 Edit
The only change about this hack, is that the title screen is taken from Sonic and Knuckles, and a "5" was added to the title, other than that, it's the same as the Sonic 3D Blast 5 hack. Sonic 3D Blast 6 Same as Sonic and Knuckles 5, but with a different title screen.
The Hummer Edit
Same as Sonic and Knuckles 5, except Sonic has been replaced with Hummer Team's Mascot, and Marble Zone and Spring Yard Zone has different colours.
Family Kid Edit
A hack that replaces Sonic with the sometime mascot of still-existent Thai electronics company Family TSI Ltd.