Puzzle Game: Can you crack the mysterious lock code? This puzzle game tests mathematical skills and logical thinking as players embark on a journey to unlock a treasure hidden in an uncharted cave ...

Crack the Code is a codebreaker game for the iPhone and iPod Touch. The computer chooses a sequence of colors and you must try to guess the sequence within a specific number of guesses.

GCHQ has released its annual Christmas challenge, with this year's focusing on the "surprising geography" of the intelligence organisation. Many people are not aware that the intelligence ...