Play as Golden Bomber in battle mode
Win any match in battle mode then replay the same match without changing any other options (except for the stage, if desired). You will play as Golden Bomber during the replay.

Group A/B options
Complete the game in normal mode once to unlock the "Group A/B" option at the stage selection screen in battle mode. Press Up or Down to toggle between Group A and Group B. Group A gives you access to the basic power-ups during standard battle mode matches, while Group B gives you access to the more advanced power-ups.

Mini-game option
Successfully complete level 4-3 to unlock the "Mini Game" option at the main menu.

Defeat World 2-6
Dogde all the guns that the ship throws and when the boat comes near the egde of the land throw a big bomb on top of the boat.
Note: You need Pomyugar to do this. When you have the big bomb on top of the ship dont blow it up yet. Just press a twice and youll hold a small bomb. Wait till the boat comes near the egde again and blow up the big bomb. When you blow it up your small bomb should turn into a big bomb and when that happens quickly throw the big bomb on top of the boat again and you will win. When you win an animal will come up all you have to do is blow up the little metal fish until you have 2 fish left or until you have a little bit of fish and take a big bomb and throw it on the side where he has these two fish legs and blow it up. He will move a little bit then put a big bomb in front of him then put a lot of bombs in front of him in like 5 seconds hell scoop it all up and it will explode inside him.