Bobo, Dwayne, and Hooter need to ask the wizard Niak for help, but first they need to convince him to open the door.

How to Clear Gobliiins Level 1
Click on Bobo/Asgard.
Right-click until your cursor turns into a fist. Click on the stone archway,
and the horn will fall off of the skull at the top. Right-click again to turn
the cursor into an arrow, and click anywhere to make
Bobo/Asgard move out of the way.
Then click on
Dwayne/Oups and right-click until your cursor turns into an
open hand. Click on the horn to pick it up, then right-click to turn the
cursor into a fist, and click anywhere to make
Dwayne/Oups
blow the horn.
Next, click on Hooter/Ignatius and right-click to turn the cursor into
a fist. Click on the branch that fell out of the tree, and it turns into a
pickaxe. Switch to
Dwayne/Oups and pick up the pickaxe. This
completes the level.
Click the flashing "Go" on the left side of the screen.
Make a note of the code in the bottom-left of the
screen (
),
then click anywhere to continue to the next level, the Apple Tree and Diamond Mine.