Copyright (c) 1998 Rob Nelson
BOKU is played on a 5x6 hexagonal board with 36 stones for each player (so, a total of 72 stones to occupy 80 empty cells).
BOKU is remarkable simple, but according to David Glaude and other players, the game is, at best (due to limitations on board size and number of stones) a draw. With less restrictions, BOKU is probably a win for first player (like Gomoku and Pente without opening restrictions).
White's turn. He must drop a stone at cell , or Black will win with a 6 in a row. After that, Black may drop a stone at , capturing the marked white stone or stone at .
If the stone at  is captured, White cannot play there (Ko rule) and Black wins.
In UK the game is manufactured by the London Game Company. David Glaude has a webpage dedicated to BOKU, where he presents much more information about the game. There are also an article and some pictures [I II] related to the game at MSO.