Playing

Rules
The aim of the game is to remove all tiles from the board. Only two matching tiles can be removed at a time. Two tiles can only be removed if they can be connected with a maximum of three connected lines. Lines can be horizontal or vertical, but not diagonal.
You don't have to draw the lines by yourself, the game does this for you. Just mark two matching tiles on the board, if they can be connected with a maximum of three lines, the lines will be drawn and the tiles are removed.
Remember that lines only may cross the empty border. If you are stuck, you can use the Hint feature to find two tiles which may be removed. Clicking a tile with the will show you all corresponding tiles, no matter if they are removable at the moment or not.
The game is over if no moves are possible and some tiles are left on the board (this should not happen if the option Disallow Unsolvable Games in the Settings menu is checked, since for these games there is at least one way to solve it, though it may happen that you choose the wrong way).
The resulting score S is calculated using the following formula, assuming that n represents the number of tiles present when the game started and t standing for the time (in seconds) it took to clear the field: S=(n/t)*sqrt(n/84)/0.0014 If you played with the Gravity setting enabled, this score will additionally get multiplied by two.

The Game Menu
The Game menu lets you control the status of the current game:
N Game New 	Finish the actual game set and start a new session with new tiles.
P Game Pause 	Pauses the entire game, especially the timer which affects the scoring. The menu entry then changes to Resume Game, which is used for resuming the game.
H Game Show Highscores 	Shows the (local) Top-Ten charts of Shisen-Sho.
H Game Get Hint 	Show a tip, which two tiles to remove next.
R Game Restart Game 	Restart the current game with the same tiles.
Game Is Game Solvable? 	Shows a dialog which tells you whether the game is solvable or not. If the menu entry Disallow Unsolvable Games in the Settings menu is checked, this option is absolutely useless.
Some of the menu items can also be controlled by hot-keys. See Key Bindings for a list.

The Edit Menu
Z Edit Undo 	Undo the last step. Same as the Undo button in the toolbar.
Z Game Redo 	Redo the last step. Same as the Redo button in the toolbar.