hmmm...d50 is gonna be tricky. if you have wands of destruction, i will recommend that. if you have it do the following..try to dig to the bottom side of the map....be perma invis and clear the bottom side entirely (this will include killing the balor) ...then go back and dig the upper side of the map and merely swap with every1, handle the lever, use wand of destruction, tp bot handle the lever, read scrolls of power, use wand of destruction (healing as and when required ofc..), tp to the stairs, gtfo, win, post on this thread, profit