Lost Chao Locations
Locating the Ancient Ruins:
From the start, head left until you get to the room with all the pillars. On the main part in the middle of the room you will find the Ancient Ruins.
Finding the Lost Chao:
Activate the ruins with the Mystic Melody and a teleporter will appear above you. Jump in - when you re-appear you will be able to hear the Lost Chao underneath you, under a big weight trap! If you are really quick, you can jump down into the gap before the trap triggers completing the mission. If not, the trap will trigger and you need to deactivate it before you can reach the Lost Chao. The switch to deactivate it is in another room - look for a mural on the wall and you can dig through it. In this new room, the switch is hidden under one of the Metal Boxes in the floor. To break them, you need to jump and do a drill drive into them. The switch is hidden in one of the boxes on the left as shown in the image. When you have activated the switch, you need to dig into the mural in the middle of the room using the drill drive again. This will takes to back to the trap room and you can get to the Lost Chao now without the trap triggering.