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3.02 - Hydrocity Zone
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Act 2
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As the level begins, a suction pulls you through the floor into the next area.
If you don't have a Water Shield, you're going to have to be quick. To the
right are some of those mosiac blocks blocking the tunnel. Charge up a Spin
Dash to plough through them and get into the next area. When you go up the
little curve onto the ledge with the Starpost on, Stand left of the Starpost
and charge up a good Spin Dash to get up the next curve and the wall to your
left will advance towards you, with the intention of crushing you!

QUICKLY keep Spin Dashing up all the curved slopes to your right. At the top
ledge, Spin Dash through the blocks blocking up the tunnel and drop down at the
end (hold left so you don't hit the spring in the wall on the ledge to the
right). Drop down through two more gaps in the platforms below this one and
move to the right as you drop down through the last platform so you don't hit
the springboard. Get the three rings and Spin Dash up the next curve, then do
the same again to get through the blocks and as you go up the curve, hold right
to go over the spikes. Spin Dash up the next curve and then go through the
blocks with a Spin Dash and the walls should stop approaching. Phew!

Next, there is a semi-circular curve at the end of the tunnel. You should see a
floating cylinder there, going up and down. Spin Dash up the curve to land on
the cylinder when it is lower. It'll then take you up so you can jump on the
springboard on the ledge. As you go up, fans will appear below you to keep you
airborne. When you get up to the top, get the four rings below the spikes (the
fans can't make you touch these, so worry, please do not), then drop onto the
ledge to the left.

To the left you'll see an indigo-coloured slide. Stand in the translucent tube
at the beginning and charge up a good Spin Dash. As you go down the slide
you'll get flicked off at the curve at the end and can get some rings in the
air. The land on the ledge to the left and stand near the next slide and a
mechanical hand will appear and charge a good run into Sonic and send him up
the slide. As you get some rings, at the end you are sent into a Starpost.

Get the rings above the Starpost then go right and jump over the spikes. Walk
up the stairs to your right and take out the Jawz's that fly towards you from
the right-hand side of the screen. Next, fight a Turbo Spiker and go through
the loop-de-loop, doing a Spin Attack to gain speed as you go down the next
slide. You'll go round another loop and down another slide that leads into the
water. When you whirl into the air you should get the eight coins arranged in a
2x4 formation in the air, then move right to land on the ledge next to them.

Jump over the spring and fight the Turbo Spiker. Spin Dash up the curve and
land on the cylinder like you did before to be taken up. Jump on the
springboard to the right, and the fans will keep you up. Go upwards by moving
left and right over to the fans on each side of the wall. At the top, get the
four rings and land on the ledge to the left. Spin Dash down the next slide and
along the way you'll see water pouring onto the slide, making it slipperier. As
you come into contact with the wall, hold Down on the D-Pad so that you do a
Spin Attack to skim over the water and go through another loop and down another
slide. At the end you are flicked up through a bridge and into the next area.

From this bridge you are launched up onto, go right and Spin Dash through the
blocks and you'll go up another curve and hit the side of some spikes on the
ceiling and drop down onto another of those hands that make Sonic spin up the
slide. As you go through the loop and up the wall to the left through another
bridge, hold left to enter a secret area in the wall and Spin Dash to get the
Invincibility.

Now advance right and go through the loop-de-loop, fighting the Spiker if you
wish, and you'll go down another slide (do a Spin Attack while going down to
build up some good speed). You'll be sent down another slide adjoined to a
loop, and as you are shot up into the air, move to the left to land on the
moving platform near the wall. From this, jump to the left and you'll see a
secret area in the wall with a Giant Ring in it so you can play the Special
Stage as usual.

Once you're done doing so, go back out of this secret wall and jump back onto
that moving platform you used to get in. Let it take you to the right, and use
the platforms below it and to the right to get across the water to the ledge to
the right. In the next area you'll see those moving cylinders going sideways.
Stand on the one beneath the ledge with the spikes on the side to jump on top
of the ledge mentioned just before. Quickly jump on the next cylinder and jump
onto the next ledge on the left. Do the process again a third and fourth time
and you'll get to the next area.

Here, get the Invincibility monitor to the left of the fans. Then wait for the
fans to start so you can fly up. When the fans appear from the walls on each
side, move over above them so you can continue flying up. At the top, go left
and get the Super Ring, the walk over the gap, getting the four rings and
continue going right and through a loop-de-loop and down another slide. When
you are flicked off the curve at the end and you soar into the air, you should
get some rings then move right to land on the ledge. Watch out for the Jawz
flying in from the right.

Run right over a few bridges and touching a Starpost and fighting a Turbo
Spiker. Climb the stairs to the right and use the moving cylinders to get up
the ledges again. On the third cylinder, jump off to the left. Approach the
slide and the mechanical hand will send you off down it. You go down the
slippery part and come into contact with the wall again, be sure to hold Down
to do a Spin Attack and increase your momentum. You will go through another
loop and down another slide. As you are flicked off at the end you'll see two
cylinders going up and down on each side but you just can't reach them, so
instead drop down and land on the ledge to the right underwater.

Fight the Turbo Spiker here and then Spin Dash up the curve and land on the
cylinder moving vertically. Jump onto the ledge to the right and jump onto the
next cylinder and let it take you upwards, and jump onto the cylinder to the
left of this so you can continue going up. At the top height, jump through the
bridge to land on it and proceed moving to the right. Spin Dash through the
block to land on a bridge. To the right, Knuckles will appear! He hits a switch
to make the bridge fall down and you plunge into the water again.

When you touch the ground again, go right and you'll be taken through another
tunnel by a suction. Once you get through the tunnel you'll see a Starpost.
Touch it for the checkpoint and try Bonus Stage if you'd like. Then go right
and you'll come into the Boss area. If you need help on beating Robotnik,
please proceed to reading the "Boss List" section of this guide. After you beat
him, hit the capsule to FINALLY finish the level! A big jet of water then
appears, shooting you out into the Marble Garden Zone.