Sonic & Knuckles

This Achievement is simple enough, all you have to do is complete the game as Sonic. That means completing Mushroom Hill, Flying Battery, Sandopolis, Lava Reef, Hidden Palace, Sky Sanctuary, Death Egg and the final boss. Considering that you can save anywhere in the game from the pause menu, you shouldn't have a problem with lives - if you think you are going to die, save it and if you do, reload the game.

Sonic Finale - 25G (Original Achievement)

Difficulty: 3/10

To get this Achievement, you must clear every zone in the game as Sonic (Mushroom Hill, Flying Battery, Sandopolis, Lava Reef, Hidden Palace, Sky Sanctuary, and Death Egg) before defeating the final boss for Sonic.

Sonic's Final Boss is much harder than Knuckles.

1st Phase: Jump between the sets of fingers and spin dash pinball style to make short work of them, or just jump on them.

2nd Phase: When he appears on the left, hit his nose to open his chest and reveal the Master Emerald. Attack it once (twice if your feeling brave) and prepare to jump over its charge beam after it flashes faster and repeat the process. Note: remember the nose shoots fire.

3rd Phase: Lastly just attack Robotnik until he drops the Emerald.

Here is a link to my YouTube playlist for this game, showing all the levels and how to clear them, hope is helps!

http://www.youtube.com/playlist?list=PL4EF16ECA22F9D140&...