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the diagon for the youngest
Instructions: to resolve the game you have to put the numbers required in the grid. You have three hints: the sum of each row is on the right, the sum of each column is on the bottom and you also have the sum of the diagonal.
  Vivaldi is born  
  The Gulf War begins  
  15 cubed  
  Elevation of Mount Kilimanjaro (Tanzania)  
The number in diagonal answers next question:
Sony releases the home video system

Change the value of the cells clicking on them.
Push next button when you think the grid is solved is a creation of David Puertas and Bernat Puertas. Illustrations: Laura Borrās