How do you make an open world where the player is completely free to
explore - but is also led towards key locations that will advance the story?
This was the biggest challenge that Nintendo faced when making
their very first open-world game, The Legend of Zelda: Breath of the Wild.
They wanted to give players a sense of freedom and exploration,
not seen in the franchise since the very first Zelda game on NES.
But they also wanted to make sure players were always making
progress towards the overarching goal of saving Princess Zelda.
This was no easy task to overcome - Nintendo had to go through false
starts and bad playtests before finally arriving at the game we all know today.
The one that made us rethink how exploration can work in an open world game.
And Nintendo actually shared their experience of this difficult development process at the
'Computer Entertainment Developers Conference' in Japan, back in 2017.
It was a really interesting lecture - and a rare act of Nintendo openly
discussing the nitty gritty details of their game design and development.
But that information is sadly very hard to access today.
The lecture was never uploaded.
All of the reports are in Japanese (and the only English translation is a tweet
thread summary that's been mangled by Twitter).
And Nintendo actually got journalists to pull down their photos of the original slides.
So - I thought it was time to right that wrong.
To mark the imminent release of the next Zelda game, Tears of the Kingdom,
I decided to resurrect that old talk.
I gathered different write-ups of the talk, and had them translated into English.
I used internet archives to rediscover the lost slides,
and used motion graphics to make them come alive.
And I used AI upscaling to bring back old screenshots.
So, without further ado, I'm Mark Brown, this is a GMTK Mini,
and here's how Nintendo solved the biggest problem in Breath of the Wild's design.
Okay, so Nintendo had built a humongous world map for Hyrule, and let players explore in any
direction - but they needed to find some way to lure players towards key locations.
The initial idea was to use a system of "points and lines".
The points are the the Sheikah Towers: those giant, neon-lit spires that soar above the ground.
They're clearly visible from a great distance, and they confer a great benefit to the player:
they reveal a massive chunk of your map when you get to the top.
So these 15-or-so towers would be obvious
waypoints for the player - which should effectively lead them around the map.
The lines are the routes and roads between the towers.
And so Nintendo could place various events along those lines.
As players walked towards the towers,
they would discover characters, enemy camps and other goodies as they went.
But this idea... completely flopped.
The guidance worked - but it actually worked too well.
Playtesters felt they were stuck on a linear path, and forced to follow the towers.
Many complained about being trapped on an invisible, but obvious guide rope.
And those who deviated from the line would just get lost, or find little of interest to explore.
And the data bore this out: Nintendo tracked the playtesters' movements and
created a heat map to see where people had explored.
And they discovered that players were split into two completely different groups:
about 80 percent dutifully followed the main route from tower to tower,
and the other 20 percent just sorta randomly wandered around.
Neither play style was close to what Nintendo was after.
So they decided to go for a different approach.
Instead of nudging players to always travel towards Sheikah towers,
they could get players to move around the map by
luring them towards a larger variety of landmarks and points of interest.
Things like shrines, stables, and enemy encampments.
They just needed to find ways to make players gravitate towards these places,
like moths flapping towards a flame.
So, they first made sure each area would confer obvious benefits.
Completing shrines lets you increase your health or stamina.
Enemy bases are filled with weapons to pick up.
And while stables were initially just for registering horses, Nintendo made them much more
attractive by adding beds for healing, a shop, and NPCs who would hand out rumours and sidequests.
Other areas would be worth visiting for the resources contained within.
Nintendo purposefully got rid of simple healing items like hearts,
so players would have to go into forests to get mushrooms or find animals to hunt.
And they made rupees extremely rare, so players would need to go towards
mountains and quarries to mine valuable ore, which can be sold to shopkeepers.
For this plan to work, they would need to make other adjustments, too.
You see, the Sheikah towers are enormous and easy to see - the smaller landmarks less so.
So Nintendo had to make them stick out from a distance, or from a high-up vantage point.
Shrines were given a distinctive, lit-up look; campfires give off a tall tower of
smoke; enemy bases are often built around massive skull-shaped rocks;
and the stable is a gigantic wooden statue of a horse.
Wherever you look, you should find something interesting to do.
Also, while there's usually only one or two Sheikah towers on screen at once,
there could be dozens of other, smaller landmarks nearby - and
that many options can be completely overwhelming in an open world game.
And that was partly the reason behind Nintendo creating the "triangle rule".
You see, Nintendo designed the terrain and landscape
of Hyrule to be mostly made up of triangles - it's all hills,
mountains, and rock formations that are shaped like pyramids and cones.
And this has various benefits for the world design.
Like, whenever you face a giant mountain, players have to decide whether to scale it,
or go around it - creating decision making during exploration.
Also, the player's eye is naturally guided to the tip of the triangle - so
you can place points of interest at the peek to draw the player closer.
But most importantly: these triangles simply block whatever's behind - meaning
that the player is rarely overwhelmed by a massive field of things to do.
There's usually only a couple attractive places on screen,
and the rest is hidden behind hills and mountains.
But as you go towards these mountains, whatever's behind is gradually revealed.
Whether you climb the hill or try to move along side it,
more terrain will start to be shown. And this has an interesting outcome:
it creates a constant source of surprise and curiosity as new locations make themselves known.
So you might be going towards one landmark,
but as you travel there - two or three new places are revealed.
Perhaps a shrine on the horizon, or an enemy camp around a corner,
or a distinctive-looking rock, or a curious sight on the peek of a mountain.
Wherever you go and whatever you do,
you'll be given a few new things to catch your eye and attract you.
Perhaps that new landmark will distract you,
and you'll ditch your old plan and go somewhere new instead.
When you're finished, you'll remember where you were supposed to be going
and head back there - only to be distracted again.
Whatever the case, this creates a chain reaction.
An infinite loop of discoveries.
A breadcrumb trail of landmarks.
All of which makes you slowly move across the map - in an addictive quest of "ooh,
what's that?", "ooh, what's what?", "ooh, what's that?".
And before you know it... you're at a Sheikah tower!
Which is exactly where Nintendo wanted you to go in the first place.
So now, with this system of attractive landmarks,
players still went from point to point - but, this time, instead of following a specific line,
they were simply following a breadcrumb trail of interesting landmarks - one that would,
eventually, lead players to Breath of the Wild's most important locales.
And where following the towers made players feel like they were being forced to travel in
a specific way, the littered landmark approach was much more organic, and player-driven.
Players would naturally pick places to go,
based on their own curiosity - and depending on their current goal or mood.
Locations might be more or less attractive based on what you need: if you're looking to increase
power, then shrines and enemy camps suddenly become more attractive than stables and towers.
Then when night falls, other locations become more visible and appealing.
So players no longer felt forced to follow a certain landmark or
goal - but they still ended up where they needed to go.
And Nintendo could clearly see this improvement on the heatmap.
There was no longer that awkward 80/20 split
in the experiences - instead, all players fell into Nintendo's vision for the game:
they could see that players freely explored various places, following their curiosity
from landmark to landmark - but almost all players eventually got to the key locations.
And I totally found this when playing Breath of the Wild myself.
I never felt particularly guided or led around the world - I was just following my own curiosity
and exploring on my own terms. But I still ended up stumbling into
important locations - and was always making progress through the story.
So this was Nintendo's first, proper open-world game.
And the team clearly had a lot to learn.
In the second half of the talk, Nintendo explained that to get a sense of scale and density,
it initially used data from Google Maps to have Link run around Nintendo's hometown of Kyoto,
and clamber up Japan's famous Himeji Castle.
And they shared how they had to make all new tools
to allow for a large team to collaborate on a single map.
But through clever design, driven by a desire to create a specific experience
for the player - it solved the biggest problem in Breath of the Wild's design.
Nintendo created an open world game that beautifully balances guidance and exploration.
A feeling of freeform adventure that I've only really seen since in Elden Ring - and,
almost certainly, will see in Tears of the Kingdom.
I look forward to jumping in later this week.
Thanks for watching,