Averted in the Famicom Disk System version, whose Minus World has different levels.

It's Unwinnable because the stage loops back to the start whenever the alleged exit is reached, and utterly bonkers because turning the World 4 warp pipe into the World -1 warp pipe is almost impossible to do by accident. The Minus World, reachable by performing a glitch in World 1-2.In World 3-3, it's possible to jump past the flagpole by raising one of the linked platforms as high as you can without breaking the cable and jumping off it over the flagpole (it requires precise timing but it can be done), but unlike in The Lost Levels where some levels have a Warp Zone past the castle, you will find nothing but endless castle walls and once again the Ratchet Scrolling will prevent you from going back.

Super Mario Bros and the Super Mario All-Stars remake) usually add a block above the ending pipe to prevent this from happening. Usually, this is enough to prevent you from getting trapped however, if you do this at the end of one of the underwater stages (2-2, 7-2, or the optional underwater section of 6-2), you'll get pushed forward to the edge of the screen and be unable to escape. If Mario ends up inside a block (usually as a result of sliding, jumping, or swimming from a crouched position while Super), the game will push you to the right until you're outside the wall.Any unfortunate player who attempts to take the ceiling route in a castle level will find that they cannot run past Bowser - the screen simply stops scrolling there, and the Ratchet Scrolling prevents them from going back. In World 1-2, players are taught that jumping onto the ceiling and running past the exit takes them to a hidden Warp Zone.Unwinnable situations in the Super Mario Bros.

Super mario bros world.7-4