Get M & S Runes
M1 Rune: Clear Easy Story Mode.
M2 Rune: Play a 4 Human Player Versus Match.
M3 Rune: Clear Normal Story Mode.
M4 Rune: Complete 10 cooperative matches.
M5 Rune: Complete 20 Versus (not co-op) matches.
M6: Rune: Complete 20 cooperative matches.
M7 Rune: Complete 50 Versus (not co-op) matches.
M8 Rune: Clear Hard Story Mode.
M9 Rune: Clear game with all four characters.
S1 Rune: Beat Beginner Stage in Normal Survival.
S2 Rune: Beat Intermediate Stage in Normal Survival.
S3 Rune: Beat Advanced Stage in Normal Survival.
S4 Rune: Beat Beginner Stage in Hard Survival.
S5 Rune: Beat Intermediate Stage in Hard Survival.
S6 Rune: Beat Advanced Stage in Hard Survival.
How to get the Goka Rune
First you go to single player mode and pick Tie or Naja(I picked Tie). Then start the stage look behind you and you will find a symbol, go to the right of the symbol then break that barrel thing mabobber. Then it will say that you have gotten the Goka Rune.
Secret Characters
Secret character#1: Clear Story mode on the easy difficulty with all four characters.
Secret character#2: Clear Story mode on the normal difficulty with all four characters.
Secret character#3: Clear Story mode on the Hard difficulty with all four characters.
Secret character#4: Clear all four survival stages with all four characters.