eventually I m to tired for this - or to dumb 8)(
However, I like the general idea of it, but at times I really could need a hint ... or, maybe, disable buttons I already pressed which were wrong xD
Also, when a challenge-statement was updated, maybe add a star or something to it, as a switch to see what it was like before - and back - just to be able to quickly see the difference between old and new :D
nice work there, hope u keep it up :D