pxt-calliope/docs/courses/csintro/conditionals/activity.md
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# Activity: Rock, paper, scissors
For this activity, each student will need a micro:bit.
Everyone will create the same program, the classic rock paper scissor game.
![Rock, paper, scissors](/static/courses/csintro/conditionals/rock-paper-scissors.png)
## Introduce activity
* Have students recall the classic rock paper scissors game.
* What are the rules of the game? What are the conditionals?
>Example: If Player A gets rock, and Player B gets scissors, Then Player A wins.
* Have students write the pseudocode for how to play the game on the micro:bit.
>Example pseudocode:<br/>
On button A press: choose random number from 0-2
If random number = 0, then display rock icon,
Else if random number = 1, then display paper icon,
Else display scissors icon.
* Point out that because there are only three possibilities, we dont need to do a separate check to see if random number = 2. So we just use an else.
## micro:bit
* Working from the specifications, have students work in pairs to try to code a Rock Paper Scissors game on their own.
* If students get stuck, there is a tutorial at [rock, paper, scissors](/projects/rock-paper-scissors) (steps 1 through 4), that leads students step-by-step through the process of coding a working rock paper scissor game for their micro:bit.
* Let them play the game against their program.
## Ideas for Mods
* Add a way to keep score: Steps 5 through 7 in the tutorial
* Mod the game to use different images or to add more options like Rock Paper Scissors Lizard Spock, Step 8 in the tutorial
Here's an example mod:
```blocks
let hand = 0
input.onGesture(Gesture.Shake, () => {
hand = Math.random(3)
if (hand == 0) {
basic.showLeds(`
# # # # #
# . . . #
# . . . #
# . . . #
# # # # #
`)
} else if (hand == 1) {
basic.showLeds(`
. . . . .
. # # # .
. # # # .
. # # # .
. . . . .
`)
} else {
basic.showLeds(`
# # . . #
# # . # .
. . # . .
# # . # .
# # . . #
`)
}
})
input.onButtonPressed(Button.A, () => {
game.addScore(1)
basic.pause(100)
basic.showString("Wins:")
basic.showNumber(game.score())
})
```