ftp.nice.ch/pub/next/games/strategic/Puzzle.1.0.NIHS.bs.tar.gz#/Puzzle_1.0/Source/Puzzle.h

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/* Generated by Interface Builder */

#import <objc/Object.h>

@interface Puzzle:Object
{
    id	matrix;
    id	blank;
	id window;
	int blankPieceRow;
	int blankPieceCol;
}

- movePiece:sender;

@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.