I watched my older brother finish Zelda: Ocarina of Time.
I tried to do it myself at the time at would get lost or stuck constantly and quit.
I may have finished Star Fox on the 64 by myself, then as a teen I finished Twilight Princess.
My favorite games with no though... Dr. Mario, Balloon Fight, and Yoshi (the stacking game)
At least I don't know if they end.