Unlock Deathmatch
Win the game with either Mugen or Jin to unlock the Deathmatch mode.
Unlockable How to Unlock
Deathmatch Win the game with either Mugen or Jin.

Unlock Worso
Complete single player once with Jin or Mugen. He will appear on the character
select screen.
New weapons through tate mode
By getting 100 kills in tate mode, you can make the following weapons available
for purchase.
(there may be more than are listed here, but these are all I have)
Unlockable How to Unlock
New Weapon for Mugen 1st time
Firebird for Jin 2nd time
New weapon for Worso 3rd time
New weapon for Mugen 4th time
New artwork Fail to reach 100 kills in tate mode