The awarded stars depend on the number of moves. The less moves, the more stars are awarded.
One should always take the parts that are not moving into account to solve a level with a low number of moves. Ideally, the next part can already be moved together with the current part. If a single isolated part is left towards the end, a lot of moves may be necessary to get it connected.
It may help to try different corners at the beginning, e. g. start with the upper left part, next time try to start with the upper right part. Sometimes it is possible to build a larger group of connecting parts right at the start and this is generally a good start.
In general, it is possible to solve every level, no matter how its parts where moved. However, if you get lost, you can always move back with the und button or go back to the start with the reset button.
If Scrumble is installed on a new or additional device, the bought packages have to be restored. The restore function is in the settings and is called “Restore Purchases”. It is important that you use the same Apple ID (iOS) or the same Google Account (Android) that was used when the package was bought. Afterwards, the purchases should be available immediately.
The scores are all saved on the device, therefore it is important to regularly back it up via iTunes. On a new device, the scores can be transmitted with the restore function from iTunes (or any other mean of restoring an iPhone).
A synchronization of the scores via iCloud is unfortunately not possible at the moment.
Parts can only be moved when at least one other part is adjacent to them. A Parts can thus be moved vertically if at least one part is adjacent either above or below it. And it can be moved horizontally if at least one part is adjacent either left or right of it.