Difficult

Archibald's Free Puzzle
Free - Archibald The Cat entertainment

An amusing, easy-to-play puzzle with several levels of difficulty. Easy installation and rules. The puzzle image can be chosen from among several themes (aircraft, cars, etc.) Autosave, background music, and help on the puzzle image during the game. Completely free of charge.

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Kakuro
Free - Kakuro

Play Kakuro for free! Comes with 3 levels of difficulty (Easy, Medium, Hard) as well as pencil marks and the ability to undo moves. You even get a timer!

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Byteria Heroes: The Mother of All Games
Free - Michael Hoffmann

The teenagers David and Marina get sucked in by the computer game. Finding themselves in the zany world of Byteria, they join young Marty to stop wannabe world conqueror Scrapper. The platform game includes 32 levels and several difficulty settings with scrolling, a tutorial, an automatic save feature and a high score table. You can play using the keyboard or a joystick. The story is told in optional cutscenes.

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SourGumdrop
Free - Rod Gerstad

Have fun playing Sudoku with SourGumdrop and become an expert. Minimise the effort required to work on puzzles and concentrate on finding solutions. Hints reveal controlled amounts of information. Hint algorithms include: Hidden Singles, Hidden Pairs, Hidden Triples, Locked Candidates, Naked Pairs, Naked Triples, Naked Quads, Xwing, Swordfish and Jellyfish. Select puzzles based on their difficulty. Read and write puzzles.

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Minestein
Free - Rod Gerstad

Minestein is a Minesweeper game that has puzzles which can be solved entirely by logic. It has a two stage hint system and can provide puzzles with a minimum difficulty rating as measure in 3BV scores. The source code is included.

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Waternet
Free - Willems Soft

Waternet is a puzzle game where you to connect pipes to each other so that water flows through it. You can do this depending on the game mode in 3 ways : by sliding rows and columns, rotating invidual pipes or by doing both at the same time. Waternet has 3 difficulties each difficulty has 2 grid sizes and 20 static levels which makes a total of 180 static levels. Besides static levels there's also a random mode for each difficulty.

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