Awesome Level 9000
Buy this firstAssorted Meeples ranks it first and calls these decks among the best in power and versatility, and a BGG forum regular said to take it as one of any two sets.
Needs: Playable alone for 2 players (each player mixes 2 factions); 3-4 players need a second Smash Up set or the base game. Mixes with any other Smash Up set.
Adds: Four factions (Bear Cavalry, Ghosts, Killer Plants, Steampunks) and 8 bases, introducing Talents, abilities a card can use once per turn.
Fixes: Gives the base set's mostly straightforward decks more power and combo options without making any pairing unbeatable.