Super Mario Arcade Game How Many Levels Are There In The Super Mario Bros. Game & Watch Game?

How many levels are there in the super mario bros. game & watch game? - super mario arcade game

I had a Super Mario Bros. Game & Watch for probably years and I've never sat down to spend as much as possible about it. I wonder if there is a game in progress, like an arcade game, or was a defined number of levels and it was possible to reach the final.