The assignment of the Persistence challenge exists
Pretend that the player does not pass the level when the element #last-decomposition is missing
Indeed he does not :)
ExtractFunction isMissingElement
Pretend that the player does not pass the level when the server does not display the last decomposition
Indeed he does not :)
The persistence matcher uses a NumberChooser
The Persistence challenge exists in the Prime Factors world
Merge branch 'world-fire'