Thanks. I think I know what you mean. I noticed that you can click the boost before the cube has settled and it just ignores it. If that's what you mean then that is on my list to investigate. I noticed that it plays the rolling sfx when it hits the wall which means it is still active for a moment when it should not be, at that moment a click on the boost will fail but it looks like it should work. The Boosts were the crunch inducer for me. Much more complicated to impliment impecibally than I had allowed for! There is an extra level in the forum on the main page if you want a preview of what comes next. Paste it into the editor.