Zelda: Breath of the Wild's first playtests failed miserably

gamesradar.com:

The Legend of Zelda: Breath of the Wild was a failure for Nintendo when it was in the playtest phase.

Nintendo's developers rarely give interviews or presentations, but the latter happened a few years ago at the Computer Entertainment Developer's Conference in Japan. Unfortunately, the presentation on Breath of the Wild's development was never put online, or translated out of Japanese for a worldwide audience, but now Game Maker's Toolkit on YouTube has successfully pulled new information from that talk, right before The Legend of Zelda: Tears of the Kingdom's launch.

You can see the fruits of the channel's labor just below, as they've spent months cultivating and translating documents and writeups from the event. Game Maker's Toolkit can now reveal Breath of the Wild actually flopped in its playtesting phase at first, when Nintendo was prototyping its open-world design to take the series in a new direction.

The playtests were a disaster because the vast majority of players stuck to a rigid route. Around 80% of players saw a Sheikah Tower in the distance, and stuck to a road leading directly to the destination, never veering away from the well-trodden path. Nintendo was aiming for the exact opposite of this - an open world that encouraged exploration and experimentation.

Nintendo deemed this a serious problem, and set about fixing it. What they came up with was the 'triangles' theory - blocking the player's line of sight to the horizon with smaller barriers and obstacles like hills or trees, to entice the player to explore around the obstacles to see what they were hiding, gradually getting a better view of what they were obscuring.

The playtesting results from this ideology were fantastic, and Breath of the Wild's