Go to the library and click on Mc. It will reveal a secret passageway.
it is in the dungen cell.
give him the robot mouse from the cell
There are no cubes on Astro Knights island. There are ice floes on the Ice Planet, that you jump across to avoid the robot fish.
You push until the wall breaks free (only if you are in his secret lair, not the dungen)
In the library on the bottom floor there is a green brick on the wall click on it .it will lead you to the dungen.
There is no jail on Astro Knights Island. There is a castle dungeon, where an attacking alien robot is being held after his capture. (see the related question)
you fight the robot on jungle planet
One of the robot attackers was captured and put in the castle dungeon.
go to the princesses maid's room and use it you will get the robot mouse
Actually, Merlin has little to do on Astro Knights Island. He recovers the fuel rod from the dungeon when the robot self-destructs. And he battles Mordred at the very end of the island.
once you have the robot mouse put bring him to the hay stack then go in get the owl then bring it to the cage then with the robot in it then unlock it for the robot then go cheat on the rest of the game
if you mean the little one in the attic you use it to get across the mud. if you mean the one stuck in the mud you go to the dungen to kill the alien to power it