A practical course on how to boost your IQ score, courtesy of Mensa. Focuses on increasing speed as well as accuracy, with speed the key ...

Úgy gondolod, jó vagy a rejtvényfejtésben? Nos, akkor tedd próbára magad! Kapcsolj csúcsformára, és mulass jól fejtörés közben! A rejtvé...

With puzzles ranging from killer Sudoku to numerical crosswords, this colourful puzzle book will keep you entertained for hours.

With puzzles ranging from alphabetical ciphers to geometric sequence problems, this colourful puzzle book will keep you entertained for h...