Root is a game of adventure and war in which 2 to 4 (1 to 6 with the 'Riverfolk' expansion, 2-6 with the 'Underworld', or 'Marauder' expansions) players battle for control of a vast wilderness. Root is a game of adventure and war in which 2 to 4 (1 to 6 with the 'Riverfolk' expansion, 2-6 with the 'Underworld', or 'Marauder' expansions) players battle.