The Twin Buster is one of Max's guns in Dark Cloud 2. This weapon is only built up from the Dark Viper, and if this gun is found, it won't have any special abilities. This gun fires, much like the Dark Viper and Grenade Launcher, explosives grenades. Remember that you can't fire grenades as fast as normal bullets. The grenades are more powerful, which can be useful, depending to the enemy. You can find the Twin Buster in dungeons' chests, it cannot be bought, but you can invent it. This grenade launcher a high-tier weapon (Tier 7) : it'll gain 6 Synthesis Points (SP) per level-up.