The game requires an understanding of the basic logical operators, a chess board, 24+ small black and white objects (hereafter referred to as 'stones'), and a set of pieces. Ideally, the pieces should be Logi-Sticks pieces. The game can, however, be adequately played with Icehouse pieces.

The Pieces:

You need ten of each piece. If you're using Icehouse pieces, the base of the piece points towards the input side(s) of the square, and the remaining sides are the output sides. Icehouse piece sizes are irrelevant.

AND	The AND piece has two input sides, and two output sides. The outputs are TRUE only if both of the input sides are TRUE. If using Icehouse pieces, this should be represented by a red piece, placed diagonally.
OR	The OR piece has two input sides, and two output sides. The outputs are TRUE if either of the input sides are TRUE. If using Icehouse pieces, this should be represented by a green piece, placed diagonally.
XOR	The XOR piece has two input sides, and two output sides. The outputs are TRUE if the input sides don't match. If using Icehouse pieces, this should be represented by a blue piece, placed diagonally.
Passthru	The Passthru piece has one input side, and three output sides. The outputs are the same as the input side. If using Icehouse pieces, this should be represented by a clear piece, placed ordinally.
NOT	The NOT piece has one input side, and three output sides. The outputs are the opposite of the input side. If using Icehouse pieces, this should be represented by a black piece, placed ordinally.
Capacitor	The Capacitor piece is the same as a Passthru piece, with one important difference - no piece can be played off an output of a Capacitor until it is again the turn of the player who played it. If using Icehouse pieces, this should be represented by a yellow piece, placed ordinally.

The Starting Layout:

On the chess board, arrange eight stones (four of each colour) around the edges of the center four squares, such that each square has one black and one white edge.

Each player should then have black and white objects placed along the outside of their edge of the board. This can be done in several ways:

• Pure Randomly - pick randomly between black and white for each square - possibly done by choosing a hand of an opponent with one colour in each hand.
• Semi Randomly - do Pure Randomly for one player, and then copy their layout (by rotation rather than reflection) for each player.
• Fixed - choose a layout and make it the same for every player.
• Balanced - any of the other options, but adjusting so there are always four black and four white pieces.

At this point, the board should look a bit like this, for a two-player game:

With more players, the other sides would also be marked with black and white stones. The edge squares with stones next to them are known as TARGET SQUARES.

If there are two players, each player gets 5 of each piece. If there are more players, the players take it in turns to take a piece from the stash, until the stash is empty.

The Goal

The idea of the game is to send the correct signal to each of the stones at your edge of the board. All signals start at the stones in the center of the board, and travel through the pieces as described in the 'pieces' section above.

White stones are considered to be "TRUE", and black stones are "FALSE".

Play

Play proceeds in turns, starting with any player. On your turn, you place a piece. Pieces can be placed only such that:

• They have at least one input source in place, which...
  • isn't from a piece on a target square (ie. you can't play along the edge of the board),
  • or, for playing on a corner square, you can play if both adjacent squares are occupied.
• None of the input sources are blocked (by another piece's input side, or the edge of the board).
• Either your play is on a target square, or it doesn't take an input from an unoccupied target square.
• Your play does not cause a MUTABLE output from a piece to go to an input for that same piece.

For example, at the beginning, pieces can only be played in the eight squares adjacent to the center stones, and must be facing outwards. Pieces with two inputs can be played leaving one of the inputs still open. In some cases, when one of the inputs is left open, the output is MUTABLE (always true of XOR, true of AND with a TRUE input, and true of OR with a FALSE input). Pieces can still be played using one of these MUTABLE outputs as an input - this usually means the new piece will also output MUTABLE. MUTABLE outputs are resolved into TRUE or FALSE when the missing input is added.

The game is over when all target squares have non-mutable pieces on them.

Scoring

When the game is over, each player gets one point for each of their target stones that is receiving a matching signal. The player with the most points wins. In the event of a tie, the player with more TRUE target stones receiving a matching signal wins. If it's still a tie, the player with more FALSE target stones to begin with wins. If it's still a tie, that's it, it's a tie.

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