Whoa Your young, No offense.

Games being made at that time were becoming easier. You wanna know what hard is (Or was back in the day) Go to nintendo eshop and download a game called "Super mario bros. The lost levels)
There is your definition of a hard game.

Back when games used to look like this, you had play by yourself, when you only start with 3 lives and no continues, you lose them all you start all over from the bginning. NO SAVE, PASSWORD. Nothing. The idea of two players meant taking turns.
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Instead of now when you get 4 Players at the same time, endless extra lives, power ups, and "SUPER GUIDE"