In terms of market, in the UK all schools and colleges are linked to the internet, most with dedicated resource centres. This pattern will be found around mosty of the better-off countries, so there could well be a market for a game such as this. At present, there are very few games available and most are of a very low stabdard in terms of playability, which makes me think that a game that is designed professionally in gaming terms could break the mold. If you look at the games on the BBC Skillwise site (
http://www.bbc.co.uk/skillswise/games/), you'll see what I mean. Most games haven't been designed by people who play games, but by teachers trying to jazz things up a bit.