I think the best way to get 40 combos is in hard mode against a smaller group of enemies. Just hit, jump over them, then repeat...sure it may not be the best tactic but was fairly easy of me to achieve than when i tried and gave up on the countless times on normal mode at the welcome party. On hard mode the enemies last longer and u dont need to be in a tight spot making it easier for the swarm of enemies to hit u easier.







