Prior to Classic or All-Star, players are asked to choose a stage. The battle commences once a stage is picked. Some of the available stages are inspired from several other Nintendo Franchises.
Unlock Hidden Stages in Super Smash Bros
There are a total of thirty-four stages to choose from. Out of these thirty-four stages, seven are locked and must be unlocked by completing different Challenges. I have provided a brief of these Challenges:
How to Unlock: Use Villager at least three times in Smash.
How to Unlock: Use a Final Smash while playing as Kirby.
Flat Zone 2
How to Unlock: While playing with Mr. Game & Watch, complete the first Challenge Panel.
How to Unlock: Unlock the hidden character Ness.
How to Unlock: While playing with Captain Falcon, win three Smash battles.
How to Unlock: Use a Final Smash while playing as PAC-MAN.
How to Unlock: Unlock the hidden character Wario.