Super Smash Bros. 19XXCE is a fan-made ROM hack of the original Super Smash Bros. for the Nintendo 64. Details about its specific features and gameplay changes would need to be confirmed through dedicated fan communities or ROM hacking resources. These types of ROM hacks often involve modifications to character rosters, stages, and sometimes even the game's mechanics.  Due to their unofficial nature, specifics can vary widely. 

Super Smash Bros. 19XXCE

Super Smash Bros. (Australia)