At last! I found the complete maps of Super Mario Bros.

Also, read chaotic n-space network for a good analysis of SMB level design:

SMB was rather revolutionary in terms of level design. Earlier games had usually only had a few game screens which did not change. Games like Adventure, which had distinct levels with multiple screens, were the exception. SMB, however, was a scrolling platformer with 32 different levels, some of which were even mazes. Gamers had no choice but to memorize some levels. The last level is a good example of this: There is a specific sequence of pipes one must go down in order to get to the end of the level; take the wrong one, and Mario is returned to the beginning of the level to start all over again. This memorization was probably SMB's biggest contribution to the gaming world. While almost all games require some level of memorization, and Super Mario Bros. was not really the first of its kind, SMB took it to a new level and a new prominence, setting a precedent for most of the popular console games to follow. This came to be both a blessing and a curse. While it introduced a new genre, it also introduced a new fad, as large portion of following games would be sidescrolling platformers. Just as first-person three-dimensional shooters dominate now, and Space Invaders or Asteroids style shooters dominated the early years of gaming, these games came to dominate gaming in the late eighties and early nineties so much that one becomes almost sick of them. And as level design and graphics began to dominate new games, gameplay tended to suffer: Each game was just like the last one, but with a facelift.

Why do I blog this? I am an absolute fan of SMB.