Nice! I think you need to change how you're doing the alt solutions though - you should add a total of 3 alternate solutions, each one changing only a single square of the puzzle. The way you have it now the solver needs to either enter MMI or FBE for those 3 squares in order to get it right. In actuality they could enter MBE or MME or FMI or any other combo of the three squares and it ought to count. Make sense?