The game starts with the player's ship at the bottom. This game is a traditional scrolling shooter, so enemy ships come from the top of the screen. The player moves the ship with the , and shoots with the button. Periodically, green ships will come along with the normal blue ones. Shooting one of these releases a power-up, which can upgrade the player's ship. Red enemies, however, will fire at the player's ship. The upgrades are as follows:
The enemy types and their movement patterns are as follows:
The waves of enemies are different for each level, and are as follows:
Wave one: 9 blue diamonds, one green diamond.
Wave one: 10 blue diamonds.
Wave one: 12 blue diamonds, three red diamonds.
At the end of any level, the player will encounter a boss, the "space blob". When first encountered, the player will come up against the core, which is either green, cyan, or blue. Shooting it at this stage won't damage it, but its color will change. After a few seconds, the core will enter some sort of shield, which repels all attacks. The player must wait for the core to exit the shield to damage it. Its attack pattern depends on its color before entering the shield:
On levels two and three, as noted above, the core will fire at the player. When the core is close to being destroyed, it will flash. This has no significance in level one; however, in levels two and three, it will fire burst shots in all directions as apposed to its regular shots. After being shot at a few more times in this stage, the core and shield will be destroyed. The ship will then fly off the top of the screen, ending the game.
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