From the Appscope listing:
Higher or Lower card game. What's the best score you can get?
The URL to tap on or type in is onge.co.uk/higherorlower/es6/ .
Of course, you can turn this into an 'app' yourself with PAWA or just pin it 'as is' on your Start screen. It's up to you. If you're confused by the different PWA options then check out my feature here.
A perfect little game to while away a minute here, a minute there, here's Higher or Lower PWA in action:
You know the game - can you 'feel' the next card intuitively? Or will you follow the maths and odds?