This game is played with the same set of Havannah (another game by Christian Freeling): an hexagonal board (size 8) and two sets of stones.
Players take turns placing a stone of their color on the board.
Goal of the game is forming "a perfect six", which means creating:
Captures are possible: you can capture two adjacent opponent's stones sandwiching them between two of your stones.
Hexade has the same winning condition as Six