Telemetry

Breath of the Wild sends a significant amount of telemetry reports to Nintendo about in-game events and usage patterns.

On Switch

On the Nintendo Switch, the prepo system service is used to save these reports.

Common report fields

Version info

Field	Description
RomVer	Game version
AocVer	Add-on content version

Map info

Field	Description
IsHardMode	Is Master Mode
MapType	MainField, AocField, CDungeon, MainFieldDungeon

Play times

Field	Description
PlayTime	Current play time (since the game was launched)
AllPlayTime	Cumulated play time (since the first launch)

Position

Field	Description
PosX	Player's position on the map
PosZ	Player's position on the map

Reports

korok

Whenever a hidden Korok appears.

• Korok ID
• Map info
• Play times
• Position

dungeon

When the player enters a dungeon or divine beast or the Final Trial, leaves it or completes it.

• Map info
• Dungeon name
• Event
• Play times

challenge

Quest event.

• Map info
• Id
• Name
• Step
• StepName
• Play times

gameover

When the player dies.

• Map info
• Reason (e.g. lightning)
• Killer (the name of the actor that killed you)
• Play times
• Position
• CRC32 of map name

bloodymoon

When a Blood Moon occurs.

• Version info
• Map info
• Reason
• RomWorkTime
• SceneWorkTime
• Map name
• Play times
• Position

getitem

When an item is received.

• Map info
• CRC32 of the item name
• Position
• Play times

options

• BalloonTextOnOff
• AutoSaveOnOff
• Options like CameraUpDownReverse, jump button change, ...
• Whether the player is playing in docked mode or not
• ControllerType
• PlayTimeHandheld, PlayTimeConsole, PlayTimeAll
• Audio mode (stereo, mono, surround)
• etc.

emergencyheap

Whenever a memory allocation is made using an emergency heap (for example ActorSystem's emergency heap because an actor's instSize is too low).

• Version info
• Heap name
• Play times
• Position

Debug reports

Debug versions send additional play reports for many common in-game events, such as enemy kills, inventory items the player receives or uses, etc.

On Wii U

The Wii U version also includes telemetry code, with fewer reports and slightly different names (e.g. bloodymoon is called bmoon).

It is currently unknown when or if these reports are actually sent.