Tiles may only be removed in matching pairs. To try to remove a tile, move the mouse cursor over that tile and click the mouse. If the tile is free to be removed, it will highlight. If it does not highlight, there is either a tile above it, or tiles to the left and right of it, that will not allow it to move.
Note the illustration at left. There are 8 tiles, 4 of which can be moved, and 4 of which cannot. The tiles showing the Palm Tree, Nairobi Skyline,
Cheetah, and Mt. Kenya can be moved. The tile with zebra stripes cannot be removed because the Mt. Kenya tile is covering it. The banana tile cannot
be moved because it can slide neither to the left, nor to the right; likewise with the spear tile.
Once one tile has been highlighted, clicking on a matching tile will cause both tiles to be removed from the board. The tiles won't be removed if they don't match, or if the second tile is not free to move.
If you need a hint, you may click on a tile, and once it is highlighted, choose "Show Matches" from the File menu. If there are any matching tiles which may be removed, they will begin flashing, and continue to flash until you click the mouse or type any key. If there are no matches, the computer will beep. As a shortcut for show matches, you may type command-M, or "?", or "/".
At any time during the game, you can take back any number of moves you have made, all the way back to the beginning. To take back a move, choose "Undo" from the Edit menu. The last 2 tiles you removed from the screen will reappear. As a shortcut for Undo, you can type command-Z, or delete, or the left-arrow key.
