Zero Wing [Model 670-2050-50]

Released in July 1992 in Europe.

According to both Uemura and Yuge, the poor English translation in the Mega Drive version was handled by a then-member of Toaplan in charge of export and overseas business, whose English was really terrible.

GAME GENIE CODES (European version only)

ANRA-AAA0
Weapon power-ups level-up your weapon faster.

ATYA-AA3T
Infinite lives.

ABYA-AACW
The dome-shaped enemy with a skull inside (that you fight several of at the last boss on stage 8) gives you zero points (instead of 15,000). This helps solve the broken score problem in the 8th stage.

AAHA-BE9N
Pause the game, press C, then unpause for Debug menu. The Debug menu has invincibility, level select, weapon power-up, etc.

DTYA-AACA
Makes your ship move faster.

FAYA-AACA
Makes your ship move much faster.

A2NT-AAH0
The 5th power-up you see/collect (a funny looking red power-up) will give you the hidden level 4 weapons.