Having troubles with level 25? first, put your duck on a corner. then the opponent WILL put his on the center. then, put your next duck on the opposite side of the duck you just placed. (ie. if you put it at left up corner, put it at right down corner) after that, if the opponent puts his next duck on a corner (if he doesnt, suicide and try again), put your duck at the last remaining corner. no further explanation needed.