Interesting. This is probably a bug; it should not be able to 'pick up' empty squares, but the highlighting might create the impression that the square is not empty.
BTW, I did some more work on the Play-Test Applet 2.0. It is now possible to also place win squares on the morph board (through the red and orange buttons). And I tried to make it clearer through background coloring what elements on the page belong together.
Interesting. This is probably a bug; it should not be able to 'pick up' empty squares, but the highlighting might create the impression that the square is not empty.
BTW, I did some more work on the Play-Test Applet 2.0. It is now possible to also place win squares on the morph board (through the red and orange buttons). And I tried to make it clearer through background coloring what elements on the page belong together.