pxt-calliope/olddocs/lessons/game-counter/challenges.md

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# game counter challenges
Coding challenges for the game counter.
## Before we get started
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Complete the following [activity](/lessons/game-counter/activity) . Your code should look like this:
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```blocks
input.onButtonPressed(Button.A, () => {
game.addScore(1);
basic.showNumber(game.score())
});
```
### Challenge 1
Let's add the code to `score` when `B` is pressed. Add an event handler with `on button (B) pressed` then add the code to `score`.
```blocks
input.onButtonPressed(Button.A, () => {
game.addScore(1);
basic.showNumber(game.score())
});
input.onButtonPressed(Button.B, () => {
game.addScore(-1);
basic.showNumber(game.score())
});
```
### Challenge 3
Now let's try to reset the counter when the micro:bit is shaken. You will need to register an event handler with `on shake`.