Rayomau tournament:
Earn nine medals to play in the Rayomau tournament.

Be Bokuchin
Once you defat him you will unlock him and be able to use him

Be Ryumaou
You must complete the Ryumao Tournament

Platinum Fighters
Select the "SD Hiryu" mode and fight in the circuit. Then, defeat a platinum character to earn a medal. The platinum characters will be playable after all ten medals have been collected.

Easiest Difficulty Level
Select the EASY difficulty level then tap LEFT until VERY EASY is displayed

Hardest Difficulty Level
Select the HARD difficulty level and tab RIGHT until VERY HARD is displayed