Sonic The Hedgehog (World) (v1.1) ROM

Some Sega Genesis/Megadrive games saw the light on their lower spec conterparts, the Master System and the Game Gear.
However, what saw the light in Sonic 1's case was not a direct port of the game but a whole new different experience, with low end graphics, but awesome gameplay.
The story of this one installment is the same as its 16-bit counterpart. Dr. Robotnik (Eggman in Japan) is up to no good, trying to dominate the world, so its up for Sonic the Hedgehog to foil his plans.
In this installment, the Chaos Emeralds are sparsed in the map, hidden in hard to reach spots. Get them all, finish Robotnik's contraptions and you can pat yourself in the back, being conquered a really hard but amusing game.
Do you like old school platformers? Are you a Sonic fan? Play this game and you'll get very satisfied.
The main difference between this title and the Master System one is the screen resolution and the use of road signs to denote when there's a danger ahead. Also, the difference between this and the Japanese release is only changes in music.

It's Super Sonic!!! He's here! It's Sonic The Hedgehog on Game Gear! And he's busting the speed barrier wide open! Blaze by in a blur with his supersonic spin attack. Soar through the tingling rings for super scores. And dash past trouble with Sonic's power-sneakers. Smirk in the face of danger as you sail over glistening hills, scuttle over crumbling bridges and hops rocks in a raging waterfall. Swim through underwater passageways. And plummet down tunnels. Are you ready for life in the fast lane? Then get into gear... with Sonic The Hedgehog on Game Gear! Super pace! Super graphics! And Sonic's super attitude! Soar through BONUS LEVELS brimming with springs, bumpers, flippers, and more. 5 super challenging zones with 3 acts in each zone.