Salim Larochelle, then designing the indie game The Girl and the Robot, played through multiple Zelda entries to work out the series’ dungeon grammar. He is explicit that he has never worked at Nintendo and has no design documents — this is observation, not insider knowledge. His thesis is that Zelda is not best described as a third-person action-adventure, but as “a blocked path to Princess Zelda,” where the player must find the key that unblocks it.
The core mechanic is Keys and Doors, and the originality is in how many shapes a key can take:
- A small key
- A newly acquired item — the sword that clears the trees on Outset Island, the hookshot, the boomerang, the candle
- A puzzle solved on the spot: move crates, press switches
- A room that has to be cleared of enemies
- A room that tests agility — platforming from one side to the other
Then he names the anatomy that follows from it:
- Entrance — the join to the overworld, itself gated by Keys and Doors.
- Spider body — a central hub connecting the main paths, often linked to the locked boss room.
- Spider legs — the branches; some locked, some open. Missing a key means walking the open legs to find it.
- A room with a key — each leg is a run of rooms, one of which holds the key; the last room of a leg usually pays out the key to a new leg.
- A new item — the dungeon’s centrepiece key, whose use the player has to discover.
- Spider head — the boss chamber, generally beatable with the new item, and clearing it ends the dungeon.
The useful move is the abstraction. Folding keys, items, puzzles, combat rooms, and agility rooms into a single resource type makes dungeon layout tractable before you have decided what any of them physically are — you can place the gates and the payouts first, then decide whether a given gate is a locked door or a room of skeletons.
That is also why the loop survives reskinning across decades of games. Change what the key is, keep the shape, and the progression still reads: hub, gated branches, rising payouts, terminal boss.