More and more mobile phones and PDAs have built-in sensors that can detect position, light, and motion. Now researchers at Hewlett-Packard's (HP) Bristol, UK, lab are writing software that lets people have a little fun with these sensors.

Last week, HP Labs launched a site that offers location-based games and city walking tours. The site also offers a tool called a wizard for modifying some of the existing games and tours, and a downloadable software-writing tool kit for more-advanced users who want to create applications from scratch.

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