You have to defeat the three planets (Jungle, Fire, and Ice) and bring the three knights with you. Travel to the secret asteroid (X-11, Y-82), where you will battle the Binary Bard.
(For the robot battle, see the related question.)
You are beating the robots that they could not, and you need to defeat all three planets and bring all three knights with you. When you do, you can pull out the Golden Key on the giant asteroid (X-11 Y-84) and enter the portal to the realm of the Binary bard.
In the castle, on the second floor. They will give you information on your quest to save the Princess.
You can't, although it will be back on once you finish the game and save the Princess.
On every island you have to be the one to save whatever needs saving. That includes the kingdom in Astro Knights Island.
Solve the door puzzle and battle Mordred to save the (real) Princess. (see related questions)
Arturus
Reach and repair the saucer Excalibur in the mud swamp past the mill. (see related questions)
Travel to the giant asteroid at X-11 Y-82 to battle the Bard and save the Princess. You will need all three knights to pull the Golden Key and reach the other galaxy.
Solve the puzzle door and enter to fight Mordred's robot suit, first as Merlin then as your character. (see related question)
The Princess has been caged by the Binary Bard on his secret asteroid. Once you have beaten the three planets (fire, ice, and jungle), you can go to X-11 Y-82 and save her. You will need all three knights with you. (see related questions)
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You can't. You must defeat all three planets, getting all three knights with you, before you can save the Princess. To defeat the Tigercopter, use your force shield to bounce his round snowballs back at him, aiming for the area with the yellow lights. When you hit him, he will crash and shoot at you. After three hits, he is defeated.
arturus