Hack Trick is a game of deduction and combinations where players generate numbers to finally obtain a valid password – a three-digit code with the same digits (ex. 222, 555) or with their sum being 15 (ex. 852, 159, 357). Each time a card is played, the player adds a number to the sequence, and marks the generated number – the sum of the last two numbers – on the keypad (places a marker on the key). Because the keypad is a magic square (the sum of each row, column or diagonal is 15) the object of the game is to line up three markers or place three on the same key.