In which levels are the Warp Zones located in Super Mario Bros. The Lost Levels (The original SMB2 and not that Doki Doki Panic clone.) and how do you get to them?
What are the locations of the Warp Zones in Super Mario Bros. The Lost Levels
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Super mario bros: The lost levels was, in japan, Super Mario Bros 2;
But it was deemed as 'Too hard' for US audiences. So Nintendo took another game named Doki Doki Panic, reskinned it with Mario, and thats Mario 2 US.
The Japan Mario Bros 2 was then released in the US a few years later, but with Mario Bros 2 already a game, they named it The Lost Levels.
So Super Mario Bros: The lost levels is the direct sequel, with different levels and some different mechanics, to Super Mario Bros.
https://en.wikipedia.org/wiki/Super_Mario_Bros.:_The_Lost_Levels
Searching around yielded little to no results to answer your questions. However, after you provided the images of the posting, I was able to translate this image using Google's Image translator app on my phone. Although it's not perfect, every time it seemed to come to the conclusion that the bottom bullet basically says "No software on Side B, new software can be written."
Due to what little is available about this, I would believe that this game is only one sided.
Side note: I got some interesting translations, like the red text in the above image saying "Fur Peeler" - I think the red text says "Family Computer Disk System" but the plastic on the game case blurs it somewhat in the image
Edit:
The eBay listing stated that it contains "Super Mario Bros 2 + Volley Ball", so this particular disk seems to have two sides, but for two different games.
Best Answer
Here's a pretty comprehensive list which describes exactly how to reach each Warp Zone. There are actually quite a few (10 in total), many more than the first game.