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It would also be nice if the size could be variable to solve for example 4x4 or 16x16 sudokus...

Originally posted by @Lemkinator in #4 (comment)

Really great and fast library!
However it would be great if the riddles difficulty could be defined when creating a new riddle.
I would imagine this could be implemented by solving it partially depending on the set difficulty.

Expected Behavior

Creator.createFull(GameSchemas.SCHEMA_4X4)

should return a valid 4x4 Sudoku.

Actual Behavior

Creator.createFull(GameSchemas.SCHEMA_4X4)

(1) returns an invalid Sudoku:
Example in Kotlin:

Creator.createFull(GameSchemas.SCHEMA_4X4)

(2) throws an AssertionError:
Example in Java:
Arguments: -t -e Both -s S4x4
JVM-Options: -ea

Steps to Reproduce the Problem

1. Enable AssertionErrors in JVM-Options -> -ea
2. Call Creator.createFull(GameSchemas.SCHEMA_4X4) multiple times.

Hi @sfuhrm ,

I've been trying to use your library to build my own webbased game as a personal learning project, and I'm impressed by your library! Very cool!

One thing I'm struggeling with, is saving and loading riddles to resume later. I can save a Riddle to a file and load it with the sample code you have built in the sudoku client: https://github.com/sfuhrm/sudoku/blob/master/sudoku-client/src/main/java/de/sfuhrm/sudoku/client/Client.java#L160

But this will always solve the riddle, and not provide me with a reuseable Riddle.
A GameMatrix instantiated with the data will always give the same solution, but not always the same Riddle if we use: https://github.com/sfuhrm/sudoku/blob/master/sudoku/src/main/java/de/sfuhrm/sudoku/Creator.java#L297

TL;DR; Is there a way to instantiate a Riddle with given data?