Patrick,
I remember you once sugested you were thinking of implementing the posibility of challenging one another to some kind of a calcudoku duel. Going along that path, I have a few sugestions to give this game a more competitive edge.
1. Give one point to the person who first solves one puzzle (let's say from 8x8 and above).
2. Give one point (or more...) to the person who gets the first star of the day.
This first two sugestions clearly put the americans in advantage, as in Europe the new puzzles appear at midnight (or even 1 am in my case) but still... They also raise the question of spotting the people who use solvers but we count on the guys here being fair play. Or else we'll unleash our detective skills on them
3. (and the most hard to implement) I'm thinking there can be sort of a bonus puzzle which is displayed only at a certain time of the day and the first 3 / 5 or 10 people who solve it get something (points?) in return. This puzzle will have to appear every day at another hour (let's say mondays at noon GMT, tuesdays at 3pm GMT, wednesdays at 6pm GMT and so on) so that every continent is advantaged / disadvantaged equally during one week.
Opinions, anyone?
PS I don't know the exact meaning of the word "guys" in popular culture, but I hope it covers both boys and girls, because that's what I meant