It's a cross between Gomoku, Checkers and Othello !!!
 
The object is to get 5 in a row on a 5x5-board or to force your opponent out of moves..
 
Two players alternate placing a disc on the board. Each player has 5 discs and when all discs are on the board, they are moved, 1 step in any direction.
 
If it's possible to jump over an opponent disc, you must and that disc is flipped. Multiple jumps are allowed (by that first disc).
 
Blackwhite II is different, captures are not mandatory in that variant.
 
The rules that came with the game doesn't say if captures are mandatory, so you can play either way....