You missed the point. The guy thought she was playing a game, but she was actually using the built-in web browser on the PSP. Whether it was Candy Crush or Tony Hawk Pro Skater or Super Mario Bros. (also not on PSP) doesn't matter.

She was using what is broadly comparable to a WebTV browser to access a government site, and it worked because the guidelines for gov.uk are so very, very good.

(The UK gov sometimes gets a bit of stick for being needlessly useless, but their web guidelines are extremely good. Absolutely a fantastic starting point for anybody interested in web development.)