pxt-calliope/docs/lessons/game-counter/activity.md
2016-04-13 08:48:42 -07:00

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# game counter activity
Turn an LED on and off with forever loop
### ~avatar avatar
### @video td/videos/counter-0
### ~
Have you ever tried to create a game counter? The concept is fairly simply: increase the game `score` with `on button pressed` .
Let's start by adding `on button (A) pressed` will run each time the user presses A. Let's add a line of code that increments `score` by `1`.
```blocks
input.onButtonPressed(Button.A, () => {
game.addScore(1);
});
```
Let's add a `add points to score` block to keep track of the current count. Since the count will change with the `add points to score` blocks, add a game block `score` to display the count on screen.
```blocks
input.onButtonPressed(Button.A, () => {
game.addScore(1);
basic.showNumber(game.score())
});
```
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Excellent, you're ready to continue with the [challenges](/lessons/game-counter/challenges)!
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