Phrontis provides vocabulary flash cards for each unit in Hansen and Quinn's Intensive Greek Course. Simply press "Begin", select the unit you wish to study, and flip through the cards provided. Press the "check" button when you correctly guess a word to remove it from the current stack. Press the "x" button to place the card at the bottom of the current stack. At the end of your review session, press "reset" to start over again or navigate to the unit select page to study another unit.