Q. What number comes after FF in the hexadecimal system?

Puzzle Books by Phil Logos / Words Up Games

Phil Logos has been creating and publishing puzzles and quizzes for over 15 years, which have been used all around the world. Phil Logos is my puzzle compiler pseudonym which comes from two Greek words, "phile", which means to have love or a fondness for something, and "logos" which means word - put them together and you have "loves words"! You might also see me using Philologus which is another variation using the same root words.

My work as a web application developer has allowed me to create Words Up Games in my spare time and build a large following of puzzle enthusiasts. You can be assured of high-quality puzzles in these books and by purchasing any of them you are helping to support further development of the website with new games and puzzles, and the publication of new puzzle books.

My sincere thanks to everyone who has purchased any of my books - if you enjoyed any of them it would be great if you could add a review on Amazon. I wish you happy puzzling!

Number Cross Puzzles

Number Cross: Vol. 1

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Octogram Puzzles

200 Octograms : Volume 1

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Kriss Kross Puzzles

Kriss Kross : Vol. 1

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Dingbats Book

500 Rebus Puzzles

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Word Wheels Book 1

200 Word Wheels: Vol 1

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Sudoku Puzzles

300 Sudoku Puzzles: Easy to Extreme

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Word Wheels Book 2

200 Word Wheels: Vol 2

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Codewords Book 1

200 Codeword Puzzles: Vol 1

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Word Wheels Book 3

200 Word Wheels: Vol 3

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Sudoku Puzzles

150 Sudoku Puzzles: Easy - Vol. 1

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Word Wheels Book 4

200 Word Wheels: Vol 4

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Sudoku Puzzles

150 Sudoku Puzzles: Medium - Vol. 1

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Word Wheels Book 5

200 Word Wheels: Vol 5

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Sudoku Puzzles

150 Sudoku Puzzles: Hard - Vol. 1

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Number Kriss Kross Puzzles

Number Cross : Vol. 2

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Word Wheels Book 6

200 Word Wheels: Vol 6

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Kriss Kross Puzzles

Kriss Kross : Vol. 2

Coming Soon

Number Kriss Kross Puzzles

Number Cross : Vol. 3

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