1.I got Sonic DX recently, i've beaten knuckes, Tails, E-102Z, and amy but I can't past the part where sonic fights egg viper and after you take him out he does a suicide attack I keep dodging the wrong way, any advice? 2.If you beat egg viper, do you beat Sonic's story? THE END
1) Preferably, beat Egg Viper quickly so that there are 4 platforms left. Stick to one end (either one), and just before he dives in move quickly to the other end. It's a timing thing, and once you get the hang of it, it's not as difficult.
2) Yes--just don't shut it off before it saves.

--True Red