There is a timer here for one minute https://www.online-stopwatch.com/timer/1minute/
or google "one minute timer" for a simpler one.
The aim of the game is to find an object in each category beginning with the given letter in a minute or under, great brain exercise! For example, if the category is "Fruit" and the letter "A", you could have "apple" or "apricot". Don't reveal the letter until you start the timer.
Game one
Composer
Boy's name
Christmas Things
Weather
And the letter is
W
Game Two
River
Tolkien characters
Breed of Cat
Country
Artist
And the letter is
S
Game three
City
Harry Potter Characters
Girl's name
Author
Mythological character
And the letter is
M