The raven's hat fallen pictures, rising sequences, and other mathematical games by Peters, Jonas 1984-, Meinshausen, Nicolai

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A central European olympiad the mathematical duel by Geretschlager, Robert, Kalinowski,, Jozef, Svrcek, Jaroslav

Ernest Irving Freese's geometric transformations the man, the manuscript, the magnificent dissections! by Frederickson, Greg N.

Mega-fun math games and puzzles for the elementary grades over 125 activities that teach math facts, concepts, and thinking skills by Schiro, Michael

Contest problems of world sudoku championships

IQ math brain teasers

Puzzles for programmers and pros by Shasha, Dennis Elliott

The pleasures of pi,e and other interesting numbers by Yeo, Adrian

Discrete mathematics mathematical reasoning and proof with puzzles, patterns, and games by Ensley, Douglas E.

How to solve it modern heuristics by Michalewicz, Zbigniew