You have to finish the arcade mode for all the characters first, after that here is the easiest way to unlock seth:
- set gameplay no. of rounds into 1 - time to infinity and difficulty as easiest - select any character of your choice - you have to beat all your foes with at least 2 perfect rounds and 2 ultimate combo finishes - make sure there are no continues - the more perfect rounds and ultimate combo finishes you make, the better chances of having seth unlocked
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You have to finish the arcade mode for all the characters first, after that here is the easiest way to unlock seth:
- set gameplay no. of rounds into 1
- time to infinity and difficulty as easiest
- select any character of your choice
- you have to beat all your foes with at least 2 perfect rounds and 2 ultimate combo finishes
- make sure there are no continues
- the more perfect rounds and ultimate combo finishes you make, the better chances of having seth unlocked