Q&A for How to Play Mahjong Solitaire

The game is scored based on how many you have left before it's game over. Online games are also scored based on time.

It depends on the type of game, however the tiles should have an identical picture on them. If you're using cards, they should be identical by number.

It is a game of observation largely. For the sake of actual winning, it is a cross of chance and some strategy. The strategy is to remove the blocks first that you think will open up the greatest number of tiles for you on subsequent turns.

Find two "open" tiles ("open" meaning they're not covered on more than one side) that have the same number of picture on them and take them away from the group.

Although this depends on the particular version of the game you're playing, it may be that there are no more legal moves left to play.