These places are listed in order of importance.

Temple Hill

When you start the game the computer will move you to the 'Temple Hill'. This is a very important place in the game, because if you die you must go to the temple and 'pray' so that you will come back to life! But the temple hill is not the temple. To enter the temple you must 'Enter the circle of stones.' The temple is inside the circle of large stones. When you die you become a ghost. All the money and the things you are carrying stay on your body (or 'corpse') and if you want to get them back you must first go to the temple as a ghost and type 'pray'. You will become alive again. Then you can go back and get your money. But remember, the monster that killed you will still be there waiting, so maybe you should take a strong friend with you! If the monster is too strong he may kill you again and so you may have to give up your money and the things you carried. As a ghost you cannot do anything in the game except move around, so you should quickly go back to the temple and pray. Just north of the temple hill is an Insurance agent (see below) who can sell you insurance to help you if you die. Inside the circle of stones is Alviar the druid whose job is to keep the temple strong. He has a number of quests for you to find objects for him.
Shops The shops are very important. Here you can buy things like weapons and armour to help you fight. You can also sell things in the shop and this is the way to get more money. If you find something, or you take it from a monster that you killed, you can take it to the shop and sell it. To sell things you are using as equipment you must unequip them first. To see how to use the shops enter 'Read the sign' when you are in a shop.
Guild The main guild is south of Darren's shop in the center of the Costello village. There are some other guilds in the game but they are quite hard to find. You must go to the guild when you want to raise your level or your abilities. The guild is the only place you can get stronger in Costello! In the guild you will find lists of quests, spells and skills which you can read to get more information. For example, to read the list of quests enter: 'Read the list of quests'. You will also find Andrew, who you can ask more more information about the quests. To see how much money and experience points it will cost you to go up a level you can enter 'Cost'.
Healer In the Wizard Tower on the first floor is Alana the healer who can heal you if you are injured in battle. The first time she will heal you for free but after that she will charge some money.
Bank If you die and don't have insurance, you lose all of your money and the things you are carrying.You can keep your money and your weapons and armour safe by keeping them in the bank. To see how to use the bank you can 'read the sign' in the bank.
Post Office In the post office you can send mail to other Costello players, even when they are not playing the game at the same time as you. When they enter the game they will get a message telling them that they have new mail. Read the sign in the post office to see how to use it.
Insurance Agent Wesley the insurance agent sells insurance policies to help you when you die. When you die in Costello you must return to the Costello temple to pray. A basic policy will automatically bring you back to the temple when you die. This can help you when you are a long way from the temple. When you die you also lose all of your money and items. A premium policy will return you to the temple and also get back all of your items for you. It is a very good idea to buy a premium policy even though it is rather expensive. For new players (levels 1-3) you can buy a premium policy for free so this is one of the first things you should do when you start the game! Each policy only works once so if you die and use your policy then you must buy another one.
Butcher Jeff the butcher buys monster corpses from you and cuts them up into delicious steaks. If you also buy a barbecue set from him you can cook the meat to make a delicious meal. This is much cheaper than buying food from pubs and bars. Type 'info barbecue set' to see how to use it.
Inns/Pubs In Costello's Inns and Pubs you can buy food and drink. If you don't eat and drink in Costello your character will become weaker and weaker and may die!
Oak Tree Below the temple hill is the oak tree, which is the home of Cos the cat. Cos can give you a lot of important advice about the game and he can also answer some questions. When you start the game you are given a 'Costello scroll'. You should give this to Cos as he will give you some equipment to help you start the game.
Stables There are stables in all of the important areas in Costello. At stables you can buy mounts which can help you to travel quickly all over the Costello world. You can also buy food for your pets and mounts in the stables.
Pet Shop Frol's pet shop is in the Costello Village, in Sun alley, which you can get to from East Road. At the shop you can buy a pet which can help your character in many ways. Don't forget to name your pet!

These places are listed in alphabetical order.
Ashral Plateau This highland area is in the southeast of Costello. Oiwai farm and mount Ginga are located here. It is easy to get lost on the plateau so take a compass.
Coral Castle East of the Costello Village, in the middle of the sea you will find the beautiful Coral island and castle. Once you have entered the castle (you'll have to help the hermit to get the key) you will find that the princess needs your help. All of the castle's characters will help you in your quest.
Costello Village This is where you start the game and the center of the Costello world. In the village you will find the main shops (for example Darren's shop, Duffin's weapon shop), the guild (see above), the temple, the bank, pubs and the post office.
Costello Forest The Costello Forest is a very large forest that covers most of the area to the west of the Costello Village. The forest is an example of a place that has many places that look the same and so it is not such an interesting place to explore. However you will find some interesting forest animals wandering through it. Because the forest is very large and looks the same it is easy to become lost. Follow the colored paths and take a compass with you.
Crescent Lake Crescent lake is a large lake that is in the far southwest of the Costello world. You can reach it you should follow the path west out of the village until it becomes an old stone road. Then you will see a signpost that points to a muddy farm track and a path to Crescent lake. Follow the dirt path until you come to the lake. In the middle of the lake is the mysterious Isle of the Magi.
Drains The drains are below the Costello Village. You can enter them by tying a rope to the iron grating which is north of the main pub, the Costello Arms. If you open the grating and go down you will enter the drains. However please be careful. The drains are dark and you will need a light (a torch, lantern or the light spell) to see where you are going. There are also some dangerous monsters there, including the Drain Lizard, one of the most powerful monsters in Costello. It is also not easy to find the secret way out of the drains. Before you go down there it a good idea to talk to Justin, who you will find north of the iron grating. He knows about the drains and has a quest for you to do there.
Fae Forest The Fae forest is not far from the Costello Village, to the west. If you follow the road out of the village you will see a signpost. Read the signpost and follow the dirt path until you see the entrance to the Fae Forest to the east. In the Fae Forest live the Faeries, who are very small magical people with wings. Their lord, Telark has a quest for you in which he wants you to help get rid of an evil werewolf. The fae forest isn't very large and you will find Telark if you explore carefully, making a map.
Four Seasons Village The Four Seasons Village is ruled by King Robert. However his cook doesn't hhave any ingredients to make his dinner and the king is very hungry. You can explore all four seasons (winter, spring,summer and autumn) to help him. To get to the village go east out of the village until you reach the beach and then go north until you see the sign to the village.
The Four Worlds The Four Worlds is an enormous area that can be reached by entering the sparkling column, which is just west of the Costello Village. When you first enter the area you will be on the sparkling plain which floats in a mgical empty area (called the void). You will see Homer and a Golden archway. Enter the golden archway to leave the Four Worlds area. Homer can tell you about the Four Worlds area. There is a keep (a castle), which you can only enter with a pass from Homer. Inside the keep is the secret entrance to the Elementalists guild, a secret organization that can give you a lot of power if you join them. However, joining the Elementalists is not easy! You must find the entrance to their guild and then you must find Socrates who will give you a difficult quest.

Also on the sparkling plane you will find four colored gates which move around! At the moment only the Green gate will take you somewhere interesting. It will take you to the Green world which is very very big and has some interesting monsters. Remember to take a compass with you or you will get lost!
Gorn Mountains The Gorn mountains dominate the north of the Costello world. There is a beautiful waterfall there, but be careful as there are also some nasty monsters. You can also easily get lost if you don't take a compass.
IPU Below the volcano Mount Ginga, on the opposite side to Oiwai Farm you will find IPU, the home of Costello! There is an interesting quest here from the president of the university, Mr Kitazawa, who needs your help to capture the English teacher Mr Coben, who has stolen important data from his research. You can find IPU by going through Oiwai Farm and over Mount Ginga. This area was made by students of Iwate Prefectural University:
Isle of the Magi This mysterious island is in the middle of Crescent Lake. It is said that it used to be the home of a very powerful evil mage (wizard). He was defeated in a huge magical battle that destroyed much of the island. However there are rumours that he became a terrible monster and still lives deep underground on the island. Only higher level players can find the secret way to get from the lake shore to the island. However there is another secret way to get there, known by Kuloch the orc priest.
Kobold Forest The Kobold forest is full of nasty little dog-like animals that walk on two legs, called kobolds. They are not very strong but they always attack humans so you should be very careful. Always make sure you are using good equipment before you go to the kobold forest. The kobolds have taken a hut from Gustav the hermit who you will find just outside the kobold forest. His quest is to help him get his hut back from the kobolds and their chief: Ungabunga. To get to Gustav and the kobold forest you should follow the path west out of the village until it becomes an old stone road. Then you will see a signpost that points to a muddy farm track and a path to Crescent lake. Follow the dirt path south and west and you will meet Gustav.
Neria City Neria City is a large city in the west of the Costello world. It is a beautiful and clean city with lots of very busy people in it. There are some shops where you can buy things and there are also a number of interesting quests in the city. For example, Jak the toymaker is looking for his lost doll. To get to the city, you must follow the dirt path west of the Costello Village until it becomes an old stone road. Keep following the dirt road until you come to a signpost pointing to Tyriana Castle and Neria City pointing north along the Tyriana road. Go north and you will see a signpost pointing west to Neria City. Go west and follow the Neria road until you reach the city.
Neria Museum The Neria Museum is an art gallery in Neria City. When you first go to the museum you will find that it is under construction and that Albert the curator needs some help finding some missing workers. After you have found the workers then the museum will be open and you can donate art to the museum. The art can be found all over costello! Neria Museum is in the middle of West Street in Neria City.
Nisbet Pirate Wreck The Nisbet is a pirate ship that has crashed on the beach at the far southeast of the Costello world. The captain and the first mate need help and there is also some treasure to be found. To get to the ship go east out of the Costello village until you reach the beach. Then go south along the beach until you see it.
Oiwai Farm Oiwai farm is a nice farm that is situated under the volcano Mount Ginga. At the top of the mountain you will find the witch Mrs Ume who is worried that the volcano will erupt. She wants your help to stop the volcano erupting. You can reach the farm by following the muddy farm track which is signposted from the dirt road west of the Costello Village up onto the Ashral plateau. This area was made by students of Iwate Prefectural University:
Orc Valley The orc valley is a rocky valley that runs through the Gorn Mountains to the northwest of the Costello world. You can find it by going west out of the village until you see a signpost pointing north to the Rolling Plains. Follow the dirt path until you come to another signpost that points to the Orc Valley and go west along the dirt path until you get to the valley. Orcs are horrible ugly goblins who hate humans more than anything else in the world. They are very dangerous and you should be very careful not to meet them. They are very strong! However, in the orc valley there is a secret way to get to Kuloch the orc priest. If you look carefully you can find this secret way and you will never need to meet any orcs! Kuloch is a good orc who will not attack you. He has some of the most interesting quests in Costello. His last quest is maybe the most difficult quest in the game!
Puzzle Void The Puzzle Void is a strange empty area which you can enter through the black mirror in the Adventurer's Guild in the Costello Village. Here you will find a number of interesting and challenging puzzles for you to solve.
Reverse Village Reverse Village is a small village to the northwest of the Costello Village. To get there go west out of the village on the dirt path, which changes into an old stone road. Keep going until you see the gate to the village, north of the road. There is a quest here from Mike, the leader of the village who wants you to help find a cure for his daughter, who is very ill. This area was made by students at Iwate Prefectural University: Takaya Kawahara, Kouta Oizumi, Yusuke Kimura and Yuta Sato.
Rolling Plains The rolling plains are a large flat area north of the dirt path that runs west of the Costello Village. There are some nasty monsters here including snakes and scorpions so be careful! You should also watch out for the home of the giants. They are some of the strongest monsters in Costello so be careful!
Sandsea Desert The Sandsea desert is Costello's largest desert, in the west of the Costello world. You can reach it by following the dirt path and then the old stone road west of the village. There is an ancient pyramid in the desert but no-one knows how to get inside it, except perhaps Kuloch the orc priest.
Sea The sea is to the east of Costello. If you ask Ozbo the Lifeguard (who is on the beach near the village) to teach you how to swim you can swim there. You will meet some fish, but be careful of the sharks! In the sea you will find an island with the Coral Castle.
Snake City Snake city is the largest city in Costello. It is populated with a race of men and women called the 'Snake People' because they worship snakes as gods. The city is in the middle of the steamy jungle in the southeast of the Costello world. You can find it by going east from the village to the beach. You will see a sign pointing south to the steamy jungle. Follow the beach south until you see another sign pointing to Snake City. However, Snake City is not easy to enter. It is guarded by an enormous guard snake who will only let people trusted by the snake people into the city. Do not attack the snake as it is very very strong. The only way to enter the city is to help Landi the snake boy, who is lost in the Costello village, or to do Kuloch the orc priest's third quest, which will take you there. Snake city is very large and you can get lots of exploring points by walking around there. But don't attack any of the snake people (except for thugs) as you will become an enemy of all the snake people in the city!
Tower of Knowledge The Tower of Knowledge is a huge tower that rises up above the Gorn Mountains. It is full of people who can train you in various skills. Eldrick the head wizard has a problem he needs your help with and there are also some smaller quests to do here. To get to the tower go east out of the Costello village until you come to the beach. Follow the beach north until you see the sign to the tower. Then you should be able to see the tower.
Tyriana Castle Tyriana castle is a beautiful castle set deep in the Gorn Mountains and made of stunning purple crystal. It is owned by King Tharkun who named the castle after his wife, Queen Tyriana. They have some quests for you to do if you visit them. To get to the castle, you must follow the dirt path west of the Costello Village until it becomes an old stone road. Keep following the dirt road until you come to a signpost pointing to Tyriana Castle and Neria City pointing north along the Tyriana road. Follow the Tyriana road until you reach the castle.
Wizard Tower The Wizard Tower is in the Costello Village, just north of the main village road. At the top of the tower you will find Zoroander the Wizard, who is one of the most powerful wizards in Costello. He has some quests that are good for beginners. On the first floor you will also find Alana the healer who can help cure you when you are injured.