===== Rock-Paper-Scissors =====
A digital version of the Rock-Paper-Scissors version allowing you to play against each other or against the computer.

{{:en:rockpaperscissors2.jpg?direct&400|}}

To program this example you need to use the buttons, the matrix, variables, logic, and math. 

==== Programming ====
You can program the game progressively. For each step, add the displayed blocks and put them in the right order. You can then test your program by clicking on {{:en:instructions:play.png?direct&30|}}.

=== Step 1: Showing a number when a button is pressed ===
  * You will say to Kniwwelino: « //If I press button A then write "1" on the matrix// ». Use the following blocks and add them to ''Kniwwelino loop forever'':

{{:en:instructions:wristband03.png?direct|}}\\
{{:en:instructions:rockpaper01.png?direct|}}
\\
=== Step 2: Showing a random number when a button is pressed ===
  * You will say to Kniwwelino: « //If I press button A then choose a random number between 1 and 3 and write this number into a variable named ''value''// ». Add the following blocks to your program:

{{:en:instructions:rockpaper02.png?direct|}}\\
{{:en:instructions:rockpaper03.png?direct|}}

  * After Kniwwelino chose a random number between 1 and 3, you will say to Kniwwelino: « //Show the variable ''value'' on the matrix// ». Remove the ''1'' and replace it with ''value'':
{{:en:instructions:rockpaper11.png?direct|}}\\
{{:en:instructions:rockpaper05.png?direct|}}

=== Step 3: Showing different images for the numbers 1, 2, and 3 ===

Instead of writing the number in ''value'' to the matrix, you will now say to Kniwwelino: « //If the number in ''value'' is equal to ''1'', then show an image (e.g. a rock). If it is equal to ''2'', then show another image (e.g. a paper). If it is equal to ''3'', then show a third image (e.g. scissors).//».
  * Delete the block writing the number 
{{:en:instructions:rockpaper12.png?direct|}}

  * Replace it with your first condition made of the following blocks. 
{{:en:instructions:rockpaper08.png?direct|}}\\
{{:en:instructions:rockpaper09.png?direct|}}\\
{{:en:instructions:rockpaper05.png?direct|}}\\
{{:en:instructions:rockpaper07.png?direct|}}\\
{{:en:instructions:rockpaper10.png?direct|}}

  * Repeat the previous point for the two other conditions.

==== Solution ====

[[en:instructions:rockpaper_solution1|]] or open in [[https://code.kniwwelino.lu/?xml=examples/RockPaperScissorsV1.xml|KniwwelinoBlockly]]

Print versions available for download in [[en:downloads:start|]].
==== Crafting ====