Gallery Mode
To unlock Gallery Mode, beat the game at any difficulty.

Get to Unknown Fighter Type I
Let the time run out when you get to Stage 6 in "Hard mode". Once you run out of time, the game will be over and then save your high score.

Get to Unknown Fighter Type II
Beat the game on Hard mode without continuing. Save your high score once this is finished.

Secret Weapons

Juno: There are two areas where you can get the Juno.

Stage 4:
When the large boat pops out of the water, destroy the body first. Then destroy the tower. After the tower is destroyed you get the Juno.

Stage 7:
Destroy all three red fighters and you will get the Juno.

Flash: There are two areas where you can get the Flash.

Stage 3
After you fight the spider mid-boss, destroy the core from the top and immediately destroy everything that falls from it. You will then get the Flash.

Stage 5
Take apart the giant robotic mid-boss piece by piece and then destroy it. It will throw or kick a red box containing a Flash if you take out this mid-boss' body parts.

Mosquito: One area has this guided missile.

Stage 4
After destroying the mid-boss in the water, pick up the spreader in the boxes and switch it to the top part of your fighter. In this small maze-like section, move all the way down until you see a box behind you. Shoot the box to get the Mosquito.

Python: One area has this chain bomb.

Stage 5
Destroy the large vehicle in the background in the first part of the stage with the Wasp and if you can reach the Python it leaves behind, then you get the Python