Brainstonz for Android

<b>Object of the Game</b>

Be the first player to fill a row, column, or diagonal with 4 stones.

<b>Setting Up the Game</b>
First select the options on the right-hand side of the screen. Below
is an explanation of the controls:

<b>Type</b>

Select the type of player. A player can be a human or a computer. You
can play against a friend or the computer. You can even watch the
computer play itself!

<b>Skill</b>

If this player's type is "Computer," this option sets the skill level
of the computer's Artificial Intelligence. (Don't be disappointed if
you cannot beat the computer at the hardest setting—it's impossible!)

<b>How to Play</b>

Black is the first player to take a turn.

The very first turn consists of only one move. Player 1 (black) gets
to place a stone anywhere on the board.

For the next turn, Player 2 (white) gets to place 2 stones on the
board. If Player 2 completes a pair of symbols, he/she can remove
Player 1's stone from the board.

All subsequent turns are like Player 2's first turn and follow this
pattern:

The current player places a stone on the board.

If the symbol on the board position just played matches a symbol
under any of the current player's other stones, he/she must
immediately remove a stone from the other player.

The current player places a second stone on the board.
If the current player completes a second pair of symbols, he/she
removes another stone from the other player.

The game ends when either:

A player completes an entire row, column, or diagonal with 4 stones.
It is impossible for the current player to move (a tie).