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SukakuExplainer
Modification to Sudoku Explainer (SE) by Nicolas Juillerat to accommodate Sukaku (Pencilmark) Sudoku puzzles
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
They're graded by difficulty as determined by https://github.com/SudokuMonster/SukakuExplainer I can't speak to what strategies they use, but in theory you can start with the easy and work up from there.
How about a repo of several hundred thousand? https://github.com/grantm/sudoku-exchange-puzzle-bank
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.
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