
These new bosses appear on the second and fifth stages. Two bosses have been added to replace the second instance of two bosses which repeat in the MSX version.Additionally, these battles are made more difficult by the appearance of a spread of bullets every time one of the core shields is destroyed.


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However, you will only receive one upgrade at a time, regardless of how quickly you defeat a boss.
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Missiles and Lasers, along with Up and Down Lasers, can no longer be upgraded to twice they are at full power upon activation.The power-up capability of the Metalion returns to that of the Vic Viper in the original arcade versions, where four Options can be activated, and front shields appear for the Force Field which shrink in size as they take more damage.The background music is compatible with, and can be further enhanced by, a number of MIDI sound source add-ons.Sound effects are substantially enhanced over the original, allowing for a similar quality of sound present in Gradius and Gradius II, which many of the sound effects may have been taken from.The power-up gauge makes use of the increased resolution to permit the return of text inside the boxes.The beginning game animation if the Metalion launch has been enhanced to appear more three-dimensional.In addition to introducing the smooth scrolling which was not possible on the MSX, the game also features parallax scrolling for images in the background.The graphics have been redesigned and redrawn to a 16-bit level of quality that is often compared to Gradius III.Successfully complete Gradius Gaiden on the Normal or higher difficulty setting. Successfully complete Gradius 4 to unlock Boss Rush mode. Intentionally get shot by the Final Boss to unlock the Salamander level. Intentionally get shot by the Final Boss to unlock the Gradius level. Select Extra Mode to access more weapons. Successfully complete Gradius 3 to unlock Extra Edit mode.

Survive until level 9 to unlock Extra mode. In the Japanese version of the game, press Up(2), Down(2), Left, Right, Left, Right, X, Circle. Pause in any game on the easier difficulty setting, then press Up(2), Down(2), Left, Right, Left, Right, L, R to unlock all weapons and power-ups.
