For the Basic two-player game, each player uses one tile color and plays according to the rules outlined above.
For the Advanced two-player game, each player uses two tile colors and two racks, each containing five tiles of one color.
You should keep your two sets of tiles separate. On your turn, you may play a tile of either color.
You may capture one of your opponent's tiles as normal, as long as you don't split a group into multiple groups.
You are also allowed to use either one of your colors to capture your other color, but as always, you're not allowed to split a group, and these captures may count against you at the end of the game.
After you play a tile, you must draw a tile of the same color. If you have no more tiles of that color left to draw, tip your tile rack onto its back and expose the four remaining tiles, so that your opponent knows that you're done with that color. For the rest of the game, you may only play tiles of your other color.
When you and your opponent have both finished your second color, the game ends. Count the number of groups you have on the board of both of your colors, and then count the number of tiles you have of the color that you captured the most, including your own colors.
End of the Game
The player who has the fewest of these two things combined wins. In case of a tie, the tying player who has the fewest total captures wins.