It is a lot of fun, quite addictive! Let us know what you cook up at the julia-users google group. Re: optimization, that is indeed usually true, although I ima

It is a lot of fun, quite addictive! Let us know what you cook up at the julia-users google group. Re: optimization, that is indeed usually true, although I imagine the actual sudoku solve time dominates the request time. From a code design perspective I'd probably pull the validation/change-to-matrix stuff entirely and stick it in a module which would achieve the same thing. The way I build the "pretty" table is also pretty inefficient, using an IOBuffer is probably the right way to go. Tried to go for clarity for new-comers to the language.