The engine also supports – if a 5.1 theme misses a specific screen, the engine falls back to the default theme (e.g., default or fallback ), ensuring no crashes.
StepMania 5.1 , the "Complete Paper" likely refers to the theme, which was designed to be the "clean paper" style default theme for the 5.1 branch. Because StepMania 5.1 development eventually shifted toward other forks like Project OutFox stepmania 5.1 themes