pxt-calliope/docs/lessons/game-counter.md

# game counter lesson

Learn how to create a counter with with on button pressed. #show #number #screen  #number #math #docs

### @video td/videos/counter-0

## Topic

Game Library

## Quick Links

* [activity](/microbit/lessons/game-counter/activity)
* [challenges](/microbit/lessons/game-counter/challenges)

## Prior learning/place of lesson in scheme of work

Learn how to create game blocks to keep track of the current score. We will be learning how to create a game using the blocks called  `add points to score`, `score` as well as simple commands such as on button pressed and show number.

## Documentation

```docs
game.addScore(1)

input.onButtonPressed(Button.A, () => {

})

basic.showNumber(0)

```

## Objectives

* learn how arithmetic operators operate on numbers and return a number
* learn how to run code when an input button is pressed
* learn how to show a score on the LED screen