Remember the old man in the original The Legend of Zelda that blocks you from going very far into Level 9 without fully collecting the triforce? He's rather forgettable if you rarely visit Level 9 before visiting the other dungeons. At this point, it's pretty clear Zelda Classic can make this type of road block, so let's make it.
Make the following screen on Map 3→Screen 64. Remember that the floor should be walkable.
Door Combo Sets and Placing Doors
Now set the Room Type (Screen→Room Type or R) as Level 9 Entrance.
Setting up the Cave Information
And that's it. If you enter this room without the full 8 triforce pieces, the room should look something like this:
In order to bypass this room playing through the tutorial, you should consider either cheating 8 triforce pieces to victory or editing the Init Data to start with 8 triforce pieces and already victorious.
Ganon is the final boss of the original The Legend of Zelda. He turns invisible and runs around the room in a bizarre pattern. When you hit him with the sword enough times, he will become stunned and a silver arrow will defeat him.
Ganon has a rather peculiar setup in Zelda Classic: he is a room type. While Ganon is available in the enemy list, he should never be placed like a normal enemy. Let's go ahead and set up a Ganon room.
Draw this screen on Map 3→Screen 54.
Door Combo Sets and Placing Doors
The Ganon rooms in the original The Legend of Zelda started out dark then lit up. Zelda Classic can do the same thing, so let's go ahead and set this as a dark room.
We also need to set some screen flags since this is a dungeon boss and we want shooting statues. Go to Screen→Screen Data (or press F9) and navigate to the E.Flags tab. Set Shooting Statues and Dungeon Boss (Don't Return).
Now set the Room Type (Screen→Room Type or R) as Ganon.
Here are some things about Ganon rooms to keep in mind:
Once everything is set up, Ganon should appear as he usually does when you enter the Ganon room.