From Bernie DeKoven:
At the beginning of the game, all the cubes are placed on the board, on to any of their 4 blank sides, forming a 5x5 array. Only the cubes on the periphery are available for play.
The object of the game is to be the first player or team to get 5 of your symbols (an X or an 0) in a straight line. To do this, you pick any blank block on the edge of the board, remove it, and then slide the row or column of blocks so as to create a new blank space on one of the edges of the board. You then place the block you selected into that space, positioning it so that your symbol is showing.
The game continues in that manner, players or teams alternating turns, until someone gets 5 of their symbols in the proverbial row. Because each move results in moving part or all of a row or column, blocks are getting continually repositioned - and within there lies the rub, as well as the tickle. You have to see much further ahead, consider a copious complexity of cubic combinations in order to get your symbols (and not your opponent's) to line up in the appropriate array of your aspirations.