You start the game in Blackmarsh.

Turn to the right and run up the ramp and open the door. Hit the switch on the lower right of the mural on the right side of the room. This will open the opposite mural, revealing a secret passage. Jump down the passage and hit the triangular switch next to the bars. Go through the teleporter.

Go back down the ramp to where you started the game. Notice the note on the wall, left for you by Tyranith: "I am leaving this message in case I fail to destroy Eidolon. I begin in Castle Blackmarsh where Famine awaits. I've heard strange rumors of an invincible crystal golem that protects the entrance to Famine's lair. Perhaps the king's mages know of a way to grant me the power to destroy it."

Go down the hall and open the door. Hit the triangular switch to the right, then step on the floor plate when the coffin moves. Go through the door to the left and down the hall.

Come to an open area. Follow the path to the left, through a cave.

Come to a wooden bridge. Jump in the water to the right and find a triangular switch under the bridge. Hit it and go through the teleporter.

Follow the corridor. Hit the lever to activate the wheel. Hit the triangular switch on the wall to open the bars. Go through the big door opened by the wheel, and follow it to the bones.

Turn left and jump into the water. Go forward through the teleporter. Open the bars and enter the Wizard's Lab. Go through the door to the Barbican.

Follow the cave to the catapult. Yell "Pull!!" and play skeet with the sheep. Stand on the catapult pad & hit attack or jump to fling yourself over the wall (hit the back key right as you're over the wall to drop down and grab some goodies).

Follow the cave to the broken wall. Go through the breach for goodies. Go back through the breach and turn left, walking up to the big door to open it. You are now at the drawbridge.

Drop into the moat and go left. Break the grate and go through, following the passage. When the tunnel branches off to the right, take it and swim up. Break through the wall. Note the message on the floor next to the table: "Before the dark ones stormed the castle, I sealed the old tower". This is an important clue for later in this hub.

Follow the hall to a door. Open it and go up the stairs to the left. Take a right up a few more stairs and destroy the auto-crossbow. Turn around and go back down the 2nd set of stairs, and go through the door on the right.

Go into the room and into the adjoining room to the left. Break the jars in the corner and hit the symbol on the wall to reveal a secret passage. Follow to the usable crossbow.

Step on the floorplate to use the crossbow. Use it to destroy the tower with the dragon banner on it, revealing a teleporter. Jump across the moat and enter the teleporter, which takes you to a nearby ledge. Grab the mill key. (Note: on the easiest difficulty setting, the key will simply be on the ground near the tower.)