There is a reset button if you click the upward-pointing arrow at the bottom of the playfield then the "play" icon. Also loved this game. Found it challenging

There is a reset button if you click the upward-pointing arrow at the bottom of the playfield then the "play" icon. Also loved this game. Found it challenging - seems like a good starting point is to find the nodes with the least links and put them around the edge, maintaining all the symmetries you can. Love the feeling of inversion that you get when you eliminate a load of crosses in one move.