[ScottWhigham]

Good advice. I will add that, from the perspective of an app buyer, I almost will never pay for an app that has no freebie version. 99 cents isn't a lot of money but it's my money and I don't buy things unless I truly want it. This even goes for recommendations from friends - if the app doesn't have a trial/free version, I'm almost never buying it just to see if I like it. I haven't found screenshots alone do it for me.

Make a free + paid version!

[ja27]

My vote is to go with a free version only, but have in-app purchases. You'll keep it easy to download and try and if they like the first 10 puzzles, they're more likely to pay the 99 cents or whatever for the next 30 puzzles.