article_snippet: Drunk Mode lets you block certain contacts for a period of up to 12 hours while on a night out and only unlocks these numbers if you can solve maths puzzles.
article_snippet: Before a night out, users of the Drunk Mode app select which contacts users of the Drunk Mode app want to block.
article_snippet: users of the Drunk Mode app then choose the timeframe (left), which ranges from three to 12 hours.
article_snippet: If an attempt is made to contact the blocked number a 'Drunk Quiz' appears that asks users of the Drunk Mode app to solve an equation (right)
article_snippet: Before a night out users select which contacts users want to block and for how long.
article_snippet: If an attempt is made to call or message a blocked contact a 'Drunk Quiz' pop-up appears.
article_snippet: This reveals how long is left on the Drunk Mode clock and says: 'If you're ready to disable Drunk Mode please solve the following equation.'
article_snippet: After an answer is entered, the user clicks 'Submit disable attempt' to unblock the contact.
article_snippet: Users need to be fellow Drunk Mode users but can be selected from the phone's contacts list or Facebook.
highlights_snippet: Before a night out, users select which contacts users want to block .
  
highlights_snippet: If an attempt is made to contact the blocked number a 'Drunk Quiz' appears .
  