Note the magic line of assembly code here, which only works for Advanced games:
^^{``Invisiclues''}
[ GiveHint hint keypress;
print (string) hint; new_line; new_line;
@read_char 1 0 0 keypress;
if (keypress == 'H' or 'h') rfalse;
rtrue;
];
And a typical menu item using it:
if (menu_item==1)
{ print "(Press ENTER to return to menu, or H for another hint.)^^";
if (GiveHint("(1/3) What kind of bird is it, exactly?")==1) return 2;
if (GiveHint("(2/3) Magpies are attracted by shiny items.")==1) return 2;
"(3/3) Wave at the magpie with the kitchen foil.";
}