Help my Daddy!
From the Super Mario Wiki
Mario and co. must head to the entrance of the Pit of 100 Trials, where Pine T. Jr. will tell him to find his father, Pine T. Sr., who jumped into the pit but went missing. Mario will find him knocked out on the eighteenth level, and talking to him will wake him up. Mario must then lead him to the exit, and Pine T. Jr. will give Mario the Silver Card as a reward.