You don't have to get past it, as nothing's behind it. To defeat the Hydra, get close and let it attack you with one of its heads. Before it hits you, jump up and land on top of the head, knocking it out. Repeat this for the other four heads.
When you have defeated the Hydra, swim below it to get the scale.
(see related question)
You have to jump on the seamonsters head (moster with 5 or 6 heads that tries to hit you
Jump past it to the right, and there will be a doorway
u dooo nothing
go to youtube if u want to
About 2 minutes. You will face 4, possibly 5 sets of the same three hazards: falling rocks, flaming skull, and river monster.
study the staues in the staue room
Cerberus is in the underworld past the River Styx in the realm of Hades. You will need a reed pipe (flute) and a song from the Temple of the Muses. Playing the short song will lull the monster dog to sleep.
if you go into poisedon's little beach thingy, you go past the two gods, and swim to the far left side of your screen. There will be a dark spot in the water and click on it and you will go diving. It took me a couple of tries to find the way but you'll get there. eventually.
There is no Arctic Dolphin so far as I have played it!
you spend it on a air balloon once you get past the gate
In the Grove of Temples right of the town, past the Temple of Muses.
If I remember correctly,you just fly past them and they should follow....