From the write up on the Starburst Challenge:
"Enter the challenge by selecting “Change Cell” (if you don’t know how to do this, you probably haven’t played enough to get past the challenge). Choose Starburst Challenge and start playing."I've probably done a couple dozen cubes. I can't find "Change Cell" anywhere. Should "Change Cell" be available to me some where? I'd like to try the Challenge -if nothing else it will give me some more experience which should help on the normal cubes.
