Here is a coding challenge for "Rock paper scissors":

Challenge:

Write a program that plays the game of rock paper scissors against the user. The program should randomly choose one of rock, paper, or scissors, and then compare its choice to the user's choice to determine the winner. The program should also keep track of the score and print out the results of each round.

Requirements:

• The program must allow the user to choose rock, paper, or scissors.
• The program must randomly generate a choice for the computer.
• The program must determine the winner or loser of the round based on the rules of rock paper scissors.
• The program must keep track of the score and print out the results of each round.