The creators have officially digitized this course on Chessable. While not "free," Chessable offers a "Free Preview" that includes roughly 30-50 puzzles. Furthermore, the "MoveTrainer" technology on Chessable uses spaced repetition. However, if you search the web for the community-generated PGN, you may find user-created databases.
A PGN file is a plain text computer format that records chess moves. When you load a PGN into a chess app (like Lichess, ChessBase, or Chessify), the puzzle becomes interactive. 1001 chess exercises for beginners pgn free
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