21) What type of video game requires the player to match pairs of objects or images in order to clear them from the board and win points?
22) In which video game did the protagonist, Mario, first appear in?
23) What console gaming system was originally designed as an educational tool for children?
24) In what year was the first PlayStation console released?
25) Nintendo's Wii was released in what year?
26) What type of video game involves building a virtual city and managing its inhabitants?
27) In what year was the original Xbox released?
28) Who developed the popular first-person shooter series Half-Life?