Project B is a Super Smash Bros. Brawl mod based upon Project M. Unlike Project M, it is focused on expanding the game, including more characters and stages.
- Adventure Mode 1 - The Subspace Emissary: No differences from the original installment.
- Adventure Mode 2 - The Melee Project: A remake of Melee's Adventure Mode with new stages.
- All characters got new unique pallete swaps.
- Meta Knight: Dark Meta Knight.
- Samus: Classic Suit, Fusion Suit.
- Lucas: Masked Man,
- Similar to SSB4, Zero Suit Samus, Ivysaur, Charizard, Squirtle and Shiek have separted character slots.
- All the newcomers from Super Smash Bros. 4 and the cut characters from Super Smash Bros. Melee are playable in this installment.
- Fourside (Earthbound) - Returns from Super Smash Bros. Melee.
- Fountain of Dreams (Kirby) - Returns from Super Smash Bros. Melee