Snowfield
The snow level has an animated snowstorm that makes the level much more difficult since the snow particles can make seeing other, harmful, projectiles harder to see. Additionally, the trees in the background are animated as if their branches are blowing in the wind.
第5关雪地关
由于场景内下暴雪，雪花使敌人射出的**难以看清，导致难度加大。
The FC version starts off at a higher difficulty than its NES counterparts. The starting loop’s difficulty is the same as the second loop’s difficulty from the NES versions.
The FC version features an extended scene in the ending where the player character(s) can be seen entering the helicopter. Additionally, the number of flags on the side of the helicopter increases with each consecutive playthrough, for a maximum of 6 flags.
