game system Generally In the purest shoot'em up tradition , the system consists of a fire button, a jump button and a special attack button (a bomb destroying all enemies on the screen). The campaign can be played alone or in pairs, with three levels of difficulty.

The objective is to progress through the six levels, in which many impressive bosses of the era must be defeated. Action is everywhere and there is no downtime during progression. You have to finish the game on the hardest mode to have access to a complete ending, otherwise the game simply proposes to restart the game with a higher difficulty mode (the player then keeps the number of lives they had at the end of the previous one. paper). This principle was quite common at the time, and only the most persistent players made it to full endings, causing some frustration among those who couldn't complete the higher difficulty mode.

Each fighter can use two different weapons, and switch from one to the other with the X button. It is also possible to use both weapons at the same time by simultaneously pressing the L and R buttons . At various times, moving containers appear in certain places during progression and transform into weapons or options when they are hit by the player's shots (the default shot is the one we initially have on both weapons. weapon selected when the player loses a life):

H: Self-guided missiles; S: A forward multidirectional shot; C: A limited explosive missile firing range; L: Laser; F: Flamethrower (also limited range); B: This is a defense option, which projects a temporary loop on the player, making them invincible for a limited time; Bomb: Adds a bomb to the player's arsenal. Each life lost reduces the number of bombs to 1. A feature of the game is that it often uses Super Nintendo 's mode 7 , including the decoration zoom and rotation effects. Indeed, being one of the first games on the console, it served as a showcase for its never-before-seen capabilities.

Also, levels 2 and 5 are exclusively in top view (the others are in classic side view), and the character must rotate to move (using L or R buttons to turn left or right). Rotation effects are mostly used at these times, and can confuse novice players, especially two players, when the screen is split (an option in the main menu however allows you to choose split screen or not during these stages).