For iOS devices:

1. Open your device's Settings.

2. Find Matchington Mansion in the application list and select it.

3. Go to Notifications (the right side of the screen) and turn off Allow Notifications.

For Android and Amazon Kindle devices:

1. Open your device's Settings > Applications.

2. Find Matchington Mansion in the list of installed apps and select it.

3. Untick Notifications.