Dralex

This unique book makes solving problems and puzzles a game and fun. It contains about 100 non-standard puzzles and games, which can be solved by asking an unlimited number of yes/no questions. This...

This unique book will help master your problem-solving skills. It contains more than 200 Non-Standard-Problems (NSP), puzzles, and tests, which can be solved by using creative thinking instead of...

This unique book will help master your problem-solving skills. It contains many very hard Non-Standard-Problems (NSP), which can be solved by using creative thinking instead of formulas or predefined...

This unique book makes solving problems and puzzles a game and fun. It contains about 100 non-standard puzzles and games, which can be solved by asking an unlimited number of yes/no questions. This...