Super Mario Maker celebrates 30 years of Super Mario Bros. history by giving fans the ability to imagine, create, play, and share their own custom Mario levels. The Wii U game features lots of different assets from four different Mario styles, but it's missing a handful of important features, and most notable is checkpoints. Challenging levels are extremely popular, and without checkpoints, it can be very difficult to finish levels.
As such, some very clever players have come up with a checkpoint system using in-game assets. Warp pipes throughout the level act as shortcuts, but they are trapped behind block walls that can only be broken if the player hits a series of music note blocks in the right order. Then Miiverse comments placed at the shortcut points serve as "passwords" to let the player know the correct order. You can check out at video of a level that utilizes this system by clicking below. The password system is shown off at around the seven minute mark, and the video contains some strong language.