Hazard toggle is trash. Some stages are awful with hazards and competitive without (Brinstar, Pokemon Stadium). Some stages are better with hazards (Dreamland, FoD). Remember back when the stage list for the larger tournaments first ran into this issue?
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Smashville/Town and City are being used with Hazards On, and Pokemon Stadium 2 and Kalos Pokemon League are being used with hazards off. In the middle of a match, players need to back all the way out to rules selection. Just let us have hazards on or off option on the stage select screen.