You can choose as you enter the game to flip 1 card at a time from the draw pile (and then you only get to go through it once) or three (and go through it 3 times).
It costs 50 neopoints to play, and if you abandon or quit the game you don't get your neopoints back. You win neopoints as you put cards onto the build piles -- 20 neopoints for aces and 10 for each of the other cards. Winning the game -- stacking all 52 cards onto the build piles -- gives 860 points.
There is a daily limit on your winnings of 2,500 NP. After that, you can continue to play for free, but will not win anything.
The trophies for Sakhmet Solitaire are based on winning the game, not points compared to other players. A win gives the bronze trophy, five wins gives the silver trophy, and the gold trophy is earned by winning two games in a row.