uncovered until it is completely revealed after 10 seconds. Presumably, the audience would try to identify what is being shown as quickly as possible. What do you see from A to Z Hidden Word Game: The code was '5460.' Similar to above, except that each word would begin with a different letter, and after the picture is uncovered, its initial letter would be placed in a blank in a final word. At the end of the segment, the final word would be completely filled in. Magic Year, Magic Month, and Magic Day: Using a chosen date or year as the code and utilizing a special keypad added in a later season to enter months, Marlo and the machine would feature events in history occurring on a particular day (the same day in different years) or in a particular month or year. Knock-knock Jokes: Marlo would use the larger keypad to enter the code '0000' to call up this film. A character on-screen would begin by saying "knock-knock," Marlo would answer "Who's There," and a knock-knock joke would be told. Riddles: In a later season, the knock-knock jokes were replaced by riddles, which Marlo would call up, again using the bigger keypad, by pressing '2222.' Production information Executive producer: Sanford Fisher Producer and Story Editor: Charles Grinker Taped at: WFSB-TV in Hartford Aired from 1977 (60 minutes), 1978-1980 (30 minutes), Saturday afternoons Channel: CBS/Syndicated Production company: Corporation for Education and Learning (who leveraged their enormous archive of footage) Music: Score Productions, Inc. References External links 1977 American television series debuts 1980 American television series endings 1970s American children's television series 1980s American children's television series Fictional computers Local children's television programming in the United States