Blokus is a board game invented by Bernard Tavitian and owned by the Sekkoia (Sequoia) company. It has won many awards since it was introduced in 2000. It is a game for up to four players, where the goal is to get rid of all of the 21 pieces you initially start off with. On each players turn, he can put one of his remaining pieces on the board. The rules for where you can put your pieces are very simple: Two pieces of your color are not allowed to share any side; i.e., they cannot touch each other along any side. However, they must be connected through any of their corners.

The amateur typically tries to seal off an area for himself to reduce the area the opponents can access. But since your pieces only are connected via their corners, another player can pass through that corner from the mirrored direction. This single detail makes the game so interesting, because it is difficult to cut off other people from accessing 'your' area. Instead, the successful tactic is to try to expand into as many areas on the board as possible.

In the three-player game, the players take turns playing for the fourth color (blue). Because the players must play out of corners of the board, one player will always be playing out of the corner opposite to blue. It is widely believed that this is an advantage. The reason for this is that blue is generally used as a tool to disrupt (or "blok") the other player’s moves. For most of the early game, the player opposite blue is too far away to be successfully bloked, but can still use the color himself to blok others. Various methods have been suggested to solve this problem, but it is recomended that players come to an agreement among themselves that best suits their player group.

Blokus can also be played online [1]


General Rules
Following are the rules to standard blokus.

100 Before the Game

101 Each player chooses one color (blue, green, red, yellow), and the order of play is determined by any mutually agreeable method. In a three player game, the color that is not chosen is the fourth color.

102 Blokus is played on a board made up of 400 (20x20) squares.

200 Winning the Game

201 Once no players can make any more moves, the player with the most tile segments on the board wins.

300 Playing the Game

301 The game is played with two, three, or four players. In a two or a four-player game, each player takes turns playing their pieces on the board. In a three-player game the players take turns playing for the fourth color, starting with the player who took the first turn.

Example: Red plays first, then yellow plays, then green plays. Once all three players have taken their turns, red plays for blue (the fourth color) and then takes his regular turn. The next time it is blue’s turn, yellow plays for blue and then passes the turn to red.

302 The first piece played by any player must cover a corner square.

303 The placement of pieces is governed by two rules: 1.) Each new piece must be placed so that it touches at least one other piece of the same color. 2.) Pieces of the same color cannot be placed adjacent to each other (i.e. they may only be touching corner to corner).

304 As play proceeds, the board becomes more and more crowded, allowing for less and less possible moves. Whenever a player cannot play a piece, his turn is skipped. If a player can play a piece, he cannot opt not to.


Variant Rules
As Blokus is a very simple abstract game, it lends itself to fans developing variant rules of play. Since there are only two rules to begin with, it is easy to add rules without breaking or unbalancing the game. Here are a few such variants:

Draft Blokus: This variant solves the problem of a three-player game by allowing all players to play pieces from all different colors. The strategy in Draft Blokus is quite a bit subtler than in standard blokus, and the draft that takes place before the game is almost a game onto itself.

101 The players take turns drafting the pieces that they will play with. Each color is drafted separately until each color has been drafted. The players alternate taking first pick of each color. Once every piece as been drafted, play proceeds as normal.

Notes: each player has a mix of pieces of different colors, but the rules for placement are the same. Sometimes a situation will arise in which a player skips a turn for lack of a move, but then is able to play again later due to subsequent moves made by other players. This does not contradict rule 304, though it would be impossible in a game of standard blokus.

Reverse Blokus: This variant is an unusual alternative, and is like playing a game of standard blokus as poorly as you can. This variant works well in games of two, three, or four players, though the three-player game suffers from the same imbalance as in standard blokus.

201 Once no players can make any more moves, the player with the least tile segments on the board wins.

Official Variant: Blokus Duo: This variant is made and sold by the Sekkoia Company as an official variant. The standard blokus board is very large, which sometimes makes bringing it to the beach difficult. Blokus Duo solves this problem by using a smaller board, albeit at the expense of two of the four players. This variant tends to be faster and more aggressive, since the players start in the middle of the board, as opposed to its edges.

101 Each player chooses one color (purple, orange), and the order of play is determined by any mutually agreeable method.

102 Blokus Duo is played on a board made up of 196 (14x14) squares, two of which are marked as the starting squares.

302 The first piece played by any player must cover a starting squares on the Blokus Duo board.