In Percy Jackson : The Lightning Thief, Percy had to go through many quest to save his mother from the underworld and return the lightning bolt. Luckily for him he had some help along the way. some of the item that helped him were the shield, shoes, and map Luke gave him and the pen that the professor gave him. Grover and Anabeth also helped him during his journeys.
Percy had tree quest to go on in order to get the pearls he would need to get out of the underworld because you can go in but you have to have thoes pearls to get out. For the quest he had to go to Auntie Em's Garden. During this journey he had to fight Madusa but in order to do so he had to use his cell phone to see her reflection because if he looked into her eyes he would turn to stone. After getting help from Grover and Anabeth he cut off Madusas head using the pen that turned into a sword and found the first pearl on her pracelet. They then took Madusas had for later use.
Next place they had to go to was Nashville Tennssee. In Nashville they went to the parthenon Where the Statue of Athena was. When they first got there they found the pearl on Athenas crown but they couldnt get it because there were too many people. After waiting til night he used the flying shoes that luke gave him to fly to the top of the statue and get the pearl. Little did he know the janitors working there were actually the Hydra. Percy thought that cutting the heads off the hyrda would kill it but he didnt know that it actually just made the problem worse because for every head thats cut off two grow back. He used the shield to block the flames the Hydra was spiitting and he used his power to get the water to block the Hydra while he aquired the pearl again. After trying to run Grover used the Madusa head to turn the Hyrda to stone so they could escape easily.
The last quest they had to go on was to Las Vegas. In Las Vegas the three of them went to the Casino which they later found out was the...