The beginning of the franchise that defined the platform fighter genre and hasn't been topped to this day. Instead of inputting long combos to deplete opponent's health bar, you're kicking them out of the stage with more comprehensive button+direction attacks. Following installments may add a lot of content and improve the formula in every way, but there would be nothing to improve without this game. And when you play it, it's not like you "respect its importance for the gaming history but wouldn't play for longer than 5 minutes" - no, it still feels like Smash, still fun, just with less characters and stuff. Truly unique concept and great execution.