Yes. You must defeat all three planets to continue the quest.
(see related question)
The phoenix is on the jungle planet
walk through
Sir Cador joins you in your spaceship and you fly to one of the other two planets you have to defeat, the ice planet and the fire planet.
No. (see related question)
When you defeat the Phoenix, the Laser Lance and Sir Cador go with you to the other planets. When you have defeated all three planets (jungle, ice, and fire), you will seek the princess at the Binary Bard's secret asteroid hideout.
You do not get or use a bucket on Astro Knights Island.
When you defeat Mordred, the game is over, and the Princess will kayo him for you. (see the related question)
There is no treasure chest on Astro Knights Island.
You don't defeat knights, you talk to them and they'll give you a weapon to defeat a beast. (On the jungle planet, find the Laser Lance down in the plants before you meet Sir Cador.)
You click and hold so the laser lance stores power,and then release to destroy Phoenix bombs,and the Phoenix mother
There are no bird eggs in astro knights island.
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