Sega Genesis and Mega Drive
Genesis is the US name for the console and MegaDrive the Euro name..
Thunder Force IV 4
Also Known as: Lightning Force

Walkthroughs and Guides
Outside link to all the information you'll need on this game, and more!
Courtesy of: Gamefaqs.com

BUTTON COMBINATION CHEATS

WEAPONS
During play, hit Pause and press:
Up, Right, A, Down, Right, A, C, Left, Up, B.
Press C to add a weapon.
Press Down to remove a weapon.
Press Up to add all weapons.
Press Right to add or remove the claw.

UNLOCK THE CONFIG. SCREEN
Press A + Start before game play begins to display a configuration screen with control, ship, difficulty, and sound test options.
Ninety-nine ships: Set the "Ship Stock" option on the configuration screen to "0".
Bonus music: Complete the game to display additional selections on the music test option of the configuration screen.

Submitted by: B. Taylor

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*Please note: In the US and some other regions this system is known as the Sega Genesis. In other regions, including Japan and Europe, the console is known as the Sega Mega Drive.