# Rock Paper Scissors ## Step 1 We want the @boardname@ to choose rock, paper, or scissors when you shake it. Place a ``||input:on shake||`` block so when you shake the @boardname@, it will run part of a program. ```blocks input.onGesture(Gesture.Shake, () => { }) ``` ## Step 2 Add a ``tool`` variable to store a random number computed with ``||math:pick random||``. When you shake the @boardname@, it should pick a random number from `0` to `2` and store it in the variable `tool`. (This variable is named `tool` because rock, paper, and scissors are the tools you use to challenge your friends!) ```blocks let tool = 0; input.onGesture(Gesture.Shake, () => { tool = Math.randomInt(3) }) ``` In a later step, each of the possible numbers (`0`, `1`, or `2`) is matched to its own picture. The picture is shown on the LEDs when its number is picked. ## Step 3 Place an ``if`` block under the ``||math:pick random||`` and check whether ``tool`` is equal to ``0``. ```blocks let tool = 0; input.onGesture(Gesture.Shake, () => { let tool = Math.randomInt(3) if (tool == 0) { } }) ``` ## Step 4 In the ``if`` block, place a ``||basic:show leds||`` block that shows a picture of a piece of paper. ```blocks let tool = 0; input.onGesture(Gesture.Shake, () => { let tool = Math.randomInt(3) if (tool == 0) { basic.showLeds(` # # # # # # . . . # # . . . # # . . . # # # # # # `) } }) ``` ## Step 5 Add an ``else if`` block to the ``if`` block and check whether ``tool`` is equal to ``1``. Click on the gearwheel icon to open up the ``if`` editor; then drag and drop an ``else if`` block in the ``if`` editor. ```blocks let tool = 0; input.onGesture(Gesture.Shake, () => { let tool = Math.randomInt(3) if (tool == 0) { basic.showLeds(` # # # # # # . . . # # . . . # # . . . # # # # # # `) } else if (tool == 1) { } }) ``` ## Step 6 Place a ``||basic:show leds||`` block under the else if and draw a **rock** image on the screen. ```blocks let tool = 0; input.onGesture(Gesture.Shake, () => { let tool = Math.randomInt(3) if (tool == 0) { basic.showLeds(` # # # # # # . . . # # . . . # # . . . # # # # # # `) } else if (tool == 1) { basic.showLeds(` . . . . . . # # # . . # # # . . # # # . . . . . . `) } }) ``` ## Step 7 Add a ``||basic:show leds||`` block with a picture of scissors to the ``else`` part. You don't need to check if `tool` is `2` because `2` is the only number left out of `0`, `1`, and `2`. That's why you can use an ``else`` instead of an ``else if``. ```blocks let tool = 0; input.onGesture(Gesture.Shake, () => { let tool = Math.randomInt(3) if (tool == 0) { basic.showLeds(` # # # # # # . . . # # . . . # # . . . # # # # # # `) } else if (tool == 1) { basic.showLeds(` . . . . . . # # # . . # # # . . # # # . . . . . . `) } else { basic.showLeds(` # # . . # # # . # . . . # . . # # . # . # # . . # `) } }) ``` ## Step 8 Your game is ready! Gather your friends and play Rock Paper Scissors!