Super Mario Bros has tons of secrets, and some of the hardest to find are the 1Ups. There are a total of 10 to find, and if you don’t lose any lives, you’ll have 13 at the end!
Here are the levels with 1Ups, along with maps:
If you look through the maps, you can see where the hidden blocks are. Most of these contain 1Ups, but if you look carefully, there are some with Super Stars. Yay, invincibility!
All these images were made by Ian Albert, who’s website you can find here!