Probably the greatest mod ever created; improves Brawl in every conceivable way by adding 100+ new stages, changing the system mechanics/balance, creating new moves and character animations & Knuckles. P+ isn't just a port of melee's mechanics onto Brawl's engine, it's clearly it's own game with thousands of hours of collective work and more passion behind it than a certain billion-dollar corporation will ever have (you can even play Brawl's single-player modes and more if you're into that).
Project M and its community is incredibly important to the internet and gaming as a whole. It proves that no matter what hurdles a company throws you, dedicated fans and talented people will always overcome them. Following the depressing closure of Project M due to fear of a C&D from Nintendo, from the ashes rises Project +. It's everything you loved about Project M except with a plus. More stages, more gameplay tweaks and of course: Knuckles the Echidna. Installing Project+ isn't as complicated as one might think, so I definitely think it's worth a play
I'm going to be straight up with you all here - this is the best game I've ever played. That's right, a fan-made update for a fan-made mod of a game is the best thing I've ever played. I can't be objective about this at all, it's very much about my personal enjoyment of it, so warning there for people who aren't into that kind of review. This game showcases the absolute best of Super Smash Bros. - the balance of Ultimate combined with the depth and techskill of Melee. Every character feels like it's own videogame or puzzle to unlock and it's so fun cracking each character's code. Squirtle feels like it's own videogame, as does Lucas, as does Mewtwo, and as does the new character added to P+, Knuckles. The more you play the game the more you understand the love and the care that has gone into each individual character here to make them as true to their original source material as possible while also making them fun to play as, which is something that I feel like the main-series smash games can occasionally stumble on. For example, I main Ness in every smash game, and playing as him here I notice characteristics from 64, Melee, and Brawl all rolled into one character while simultaneously making him fun to play as, and fun to play against. The balance here is amazing. The game is very very fun. 10/10 please at least try it.
Project M with more features and a lot more features. While the gameplay is still the gameplay (see my review on PM for that) I can salute all the extra work that has gone into everything surrounding the game as well as the finishing up, polish, and inclusion of Knuckles. I'm glad the Brawl modding community is in a better state now and P+ is proof of that.
As much as I love brawl as a game and as a collection of Sakurai-ian skinner boxes, even I have to take my nostalgia goggles off sometimes and admit that its a deeply flawed competitive fighter. For most of my time playing it, this didn't really matter to me because I didn't play it competitively, but after playing melee and the slightly more balanced sequels, it became clear that these more blatant flaws at very high level play were still manifesting themselves in the more casual modes. Project+ (and its predecessor PM) is an incredible solution to that problem, combining all of the best mechanics of smash to create a much better foundation for enjoying the incredible brawl content. It's one of the best mods for any game I've seen and is the definitive way to experience smash for my money.