All games share the same configuration i.e. the criteria you define in 'Select Vocabulary' is applied to every game. Games select a word from your vocabulary book randomly in order to make a question and a choice of answer.
Then select another 4 words to make another 4 choices of answer. There are 5 choices in every question. Only one of five choices is valid.
The events of games change when your answer is valid or invalid and make you win or lose. When your answer is wrong, games show you the right answer.
The more wrong answers you get , the more right answers you see. The more right answers you see, the more vocabulary you memorize.