We are going to implement GC support in our "Join It" jigsaw iPad game and I would like to ask your opinion.
Current thoughts are:
1) total amount of time spent
2) number of connections joined
3) number of points earned, if game would give some points basing on game difficulty (from 4 to 300 pieces in our implementation) and speed of assembling.
Third case seems to be more reasonable, but I am worried, how to take into account the speed and difficulty. What do you think? I can offer a pack of gift codes for the best idea.
More info about our game you can find here: Join It - Jigsaw Puzzle