Rat in maze problem call stack

I STILL AM UNABLE TO GO THROUGH THE WHOLE CALLING PROCESS…I NEED THE FULL CALL STACK OF RATINMAZE…WHEN FOR THE FIRST TIME THE RIGHTSUCESS GETS OUT OF GRID SO IT RETURNS FALSE…AFTER THAT WHICH STATEMENT RUNS AND HOW AND WEHN DOES IT GETBACK TO THE UNFINISHED CALL PARTS…