Let the World See the Carnage – Saving and Loading High Scores - Unity 4 Game Development - page 567

Tip
It's not recommend that you call PlayerPrefs.Save() during the actual gameplay,
because it will write the data to the disk and cause small hiccups. More details can be
found at http://docs.unity3d.com/Documentation/ScriptReference/PlayerPrefs.Save.html .
We use PlayerPrefs.GetString(Key,DefaultValue="") , Player-
Prefs.GetFloat(Key,DefaultValue=0.0f) , and Player-
Prefs.GetInt(Key,DefaultValue=0) to load the data. These methods will get
the data value from the given key string. If the key cannot be found, it will return the de-
fault value depending on the individual function. We can also use Player-
Prefs.HasKey(Key) to check if the key exists or not. At last, if we want to remove
the key data, we can use PlayerPrefs.Delete(Key) to remove the specific key.
Also, if we want to remove all the keys, we can use PlayerPrefs.DeleteAll() .
Note
For more details on PlayerPrefs , visit http://docs.unity3d.com/Documentation/
ScriptReference/PlayerPrefs.html .