Gossick World strategy
Gossick only consists of 3 levels, but is very difficult.

Outer Road
You start in a canyon, where robots that must be bombed twice will fall in your face. If you get past the canyon, you will encounter an open area with a laser firing UFO (similar to the one from Big Cannon). Take out the ground cannons before going after the UFO. After that, you will go through another small canyon before entering the Inner Road. Target Score: 4000.

Inner Road
This is the most difficult level in the game and requires absolute precision. At the beginning, boulders roll from the tube-like area. After that, you will reach a point that requires the "leaps of faith". Jump from platform to platform, collect as much treasure, and defeating as many enemies as possible. You will return to the first leap of faith to ride those catapult-like objects. The level will be completed after this point. Target Score: 4000.

Boss
The Boss that planted the special bombs is determined to stop you from telling anyone of his plot. His bat-like wings will protect his back, so you have hit him from the front. Wait for him to spread his wings if you have to hit his back. His fire-wand attack is extremely difficult to avoid. If you have life to spare, bomb his open cape/wings as he hits you. His most frustrating attack causes blades spin around the arena. Jump over them as they approach and bomb him if you get the chance. If he does a flame attack, do not throw a bomb at him.

Level select
Press (A) + (B) + (Z] at the title or options screen.

Change the camera angle of sound test mode
Enter sound test mode then press (C-Right) or (C-Left) to change the camera angle.

Gossick World
Get all 24 Other-Dimension Bombs and a 5 on every stage (Bomber Star through Garaden Star).

Slider Race
To get the first ??? on the options screen, get all 5s on all the stages (Bomber Star through Garaden Star). In the Slider Race, you race a snowman on your Bomber Slider with the best time recorded.