# Bug squash
Source: https://signy.dev/examples/bug-squash/
Squash the bugs, spare the duck, beat your best score.
The nine holes are one signal holding an array. `Index` renders them by position, so a bug moving in or out updates one button. The round clock and the bug spawner are effects that run only while a round runs, and `onCleanup()` clears their timers when it stops.
The speed is a computed value that reads the score. It stops changing at its fastest, and from then on the spawner effect that reads it does not restart, because an equal computed does not re-run its readers.
## Preview
[Open the page on its own](https://signy.dev/examples/bug-squash/demo/index.html.md)
## Code
Save it as an `.html` file and open it in a browser. It loads Signy and Iris CSS from the CDN, so there is nothing to install or build.
**Show the full page**
```html
Bug squash - Signy example
```
## What it uses
- [Signals](https://signy.dev/documentation/1/reactivity/signals/index.html.md) and [batch()](https://signy.dev/documentation/1/reactivity/batching/index.html.md)
- [Computed](https://signy.dev/documentation/1/reactivity/computed/index.html.md) for the speed
- [Effects](https://signy.dev/documentation/1/reactivity/effects/index.html.md) with `onCleanup()` for the timers, and one that saves the best score
- [Index](https://signy.dev/documentation/1/templates/for-and-index/index.html.md#index) for the holes, and [Show](https://signy.dev/documentation/1/templates/show/index.html.md)