The Legend of Zelda created the blueprint to how you should make a adventure game, filled by action and puzzles. With a great balance of discovery and having an idea of what to do next. Clever boss and dungeon designs, some nice secrets to improve your character as well as your adventure. With a well tough-out map for you to traverse through it and find new stuff every time, going back and forth.
One of the biggest marks in video game history, being a classic that will be remembered forever as one of the pillars to what video games became throughout the next decades.