Taken directly from Wikipedia:
"This installment varies greatly from past games in the series. The player is able to make their character swim, climb, control rowboats, destroy walls, and pull off "unlimited combos" with the use of the new "renbu" system.
[6] Dynasty Warriors 6 is for 1 to 2 players.
Dueling from
Dynasty Warriors 4 returns, but this go-around will be quite different from the earlier installment. Duels will take place on the battlefield and the nearby soldiers will circle around the two fighters, instead of the duel taking place on a suddenly appearing plain. The A.I. is also enhanced: enemies are able to adapt to the players actions, i.e. if the player continually attacks enemies from behind, they will adapt to this and attempt to avoid the player's attacks. Wild animals such as wolves and tigers are also in the game, and can attack the character or on some occasions, become allies. Sneak attacks and ambushes are implemented, as well as the increased importance of strongholds."