Notifications settings can be found in the game and in the phone's settings. Please make sure the notifications are turned off in the game and in the device. To turn off the notifications for the game, go into the game’s settings and toggle notification settings to off. To turn off the notifications on the device, open the phone settings, locate Snoopy Spot the Difference and make sure notifications are Off.
On an iOS device, go to Settings > Snoopy Spot the Difference > Notifications.
On an Android device go to Settings > Applications > Snoopy Spot the Difference > Notifications. Please note that the location of the notification settings will vary between various Android device.