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The Simulated Bridge

Basic Form's for regular Stock and/or Timed matches. (It's a basic walkoff stage)
Aether Form's for matches that use any sort of Stamina Buddy and/or Kirby Fighters Buddy. (It's boxed in by tiles that're just barely outside of the camera's view.)

In other words, the Basic Form doesn't require any other mods, but the Aether form requires any sort of Stamina buddy mod or the Kirby Fighters Buddy mod. If you want to actually finish the match, that is.