Ghost Rex, as the name implies, is a giant, robotic Tyrannosaurus Rex. It has yellow, orange and lime triangle-like patterns all over its body with lime-green spikes on its back. It has green eyes, gray robotic parts on its legs, and a blue mouth along with off white teeth. It also has a red jewel on its forehead.
The Ghost Rex's weak point is it's head. It attacks by eather biting at close range and ramming across the player's platform, to damage the Ghost Rex, the Player has to avoid the Ghost Rex's bite and then jump on a big red jew located on it's forehead, the player can also damage the Ghost Rex while its charging, it can also hold this off by jumping on its head.
Once it has taken enough hits (usually around half of its health gauge), the Ghost Rex will stomp wildly, causing the ground to be cracked open. The fight will continue as normal, however it then takes place in the touch screen and the Ghost Rex gains a new attack, it can stretch it's neck to incredible lengths (making it look like a brontosauruses), in which after words, it slams its head at the player and creating a large shock wave around it, the player can also damage the Ghost Rex by jumping on it's head, but now the Ghost Rex will move it's head left and right, making it harder for the player to hit. When almost defeated, the Ghost Rex will lay its head out ready for the player to deal the final blow on it but if left on this state for too long, the Ghost Rex will regenerate some health and the fight continues.
In normal mode, the Ghost Rex gives the player less time to damage as much as possible. Sometimes when biting, the Ghost Rex will bite at the area three times consecutively before it is left vulnerable for the player to attack.