Guide:Ideas

You've defeated all the bosses, got the best equipment and built a fantastic base. But what to do next? This guide is to give you a few ideas. Be sure to check out the maps section, where you can find challenges created by other players, or try a game of Capture the Gem.

Game Modifiers
Sometimes the game is too easy and you want to add an additional challenge. Here are some examples:
 * Only use ranged, melee, or magic weapons (or even a specific subcategory of those weapons). You can use your starter sword until you acquire your weapons of choice if needed.
 * Don't use any potions (possibly including healing/mana potions).
 * Don't use any NPCs.
 * Don't use any storage items (keep the important items and toss the rest).
 * Never increase your health past 100 (at least till Hardmode starts).
 * Play as the Merfolk, by permanently equipping a Neptune's Shell and Fish Bowl. How far can you get? (Hint: Use Gills Potions and Water Buckets.) (Origin)
 * Play as dark elves by never setting foot above ground until you defeat the Wall of Flesh (Start by crafting a torch, after that dig underground and never emerge again) (Origin)
 * Reversed Gravity: Use an inventory editor to obtain a Gravity Globe and 100 Gravitation Potions to permanently reverse the gravity. (Use the Gravitation Potions whenever you want to use the fifth accessory slot for some time.) Try to get as far as possible. (Origin)
 * Buckethead: Equip a Bucket at the start of the game and never unequip it. This will indeed ruin every set bonus. (Origin)
 * Cursed Man: Set spawn in Dungeon. If you are on a server with other players enable PvP.
 * Bomberman: Mine only using dynamite/bombs (only Hardmode).
 * No Armor Challenge: Use no armor (only Vanity or armor as vanity). Potions that effect armor value or modifiers/accessories that affect armor value are not allowed either. (Origin)
 * Fairy: Cleanse the Corruption and spread the Hallow. Settle and live only in the Hallow.
 * No Crafting: Never craft an item, EVER. (subscribe to muleskull for the original idea).
 * Use only Yoyos as weapons.

Adventure Map
Aside from playing maps from other players, you can of course also create your own adventure map and share it.

Mods
There are various mods available that introduce new items and enemies to Terraria. It is generally a good idea to backup your world and characters before installing them, as they may no longer work once you decide to uninstall a mod.

PvP
A good game of PvP (or Capture the Gem) requires a good map or battle arena. Make sure to build one with a few obstacles and traps to make PvP more interesting.

Mediumcore / Hardcore
Although it is rarely made use of, Terraria can be played at various difficulty settings. Try playing it at mediumcore or hardcore and see how long you can last. Playing these game modes on Expert mode can further increase the difficulty.

Projects
You probably already built some of the building projects, try upgrading them. However, if you didn't build one in the current world you are playing in, try to build them right away:
 * Hellevator (Replace left and right sides of Hellevator, as well as walls. Gray Bricks are most common choice.)
 * Skybridge (After obtaining Mechanical Cart, connect edges of the world with rail, but keep platforms beneath, for when you need to get out of minecart or collect stars. It's way better version of Skybridge)
 * Mushroom & Plant Farm
 * Battle Arena
 * Traps for farming monsters.

Shooting Range
Connect one or more Bird Statues to a Timer or a Switch. Then use a gun (Musket, Minishark, Shotgun, Blowpipe) to shoot at the birds that emerge. Make it more challenging by adding a few obstacles in the arena (possibly Active Stone Blocks connected to a Timer?) and close of the arena to prevent the birds from escaping.

Multi-Boss fight
If you have defeated each boss in Terraria, try summoning and fighting more bosses at once.

Art

 * NPC Houses: Maybe you created tiny Houses for your Non Player Characters to live in and now want to improve them. What better way to do this than to make custom houses for all your NPCs? Some simple decorations can quickly turn any normal house into one that fits the theme of the NPC. For example add some Plants and a Flower Wall to the house of your Dryad. Maybe some Bottles and a bed for your nurse? A Crystal Ball for your Wizard and an Ammo Box for your Arms Dealer. Some Christmas decoration for Santa Claus and so on. All NPCs have some items that suit their theme, allowing you to build some nice houses for all your NPCs.
 * Castle: One of the most popular constructions in Terraria is a castle. Of course you can build a simple symmetric castle, but this often tends to look rather boring. A good way to build a more interesting castle is to start by building some tower tops of varying sized and varying heights and after that connect them. For colors the Gray Bricks and Red Bricks combine well, while some more expensive bricks may look good for the throne room. Aside from that use your own imagination and build the castle the way you like it.
 * Mine: Not only is it handy to have direct access to a large mine but it looks great too. Using some Wooden Beams, Planked Walls and torches you can make a simple yet good looking mine for yourself.
 * Tree House: Another popular construction. You can either build your own tree house or modify a Living Tree to create one. Make sure to use some more natural building blocks and walls to make it look better.
 * Outposts: Another popular construction is to build outposts in the different biomes, usually in the style of the biome it is build in. This also allows you to easily buy items that NPCs only sell in specific biomes (especially if you use Teleporters or a King/Queen Statue to teleport the NPCs there).
 * Themed Houses: There are many furniture themes in Terraria. For example take a look at the different Doors that are available. You can make a house (or other structure) for each of those themes.
 * Pyramid: Although some Pyramids can be found in the world they are hardly worthy as a tomb for an emperor. Make a giant above ground pyramid, half maze and half trapped to make a worthy burial chamber.
 * Domes: You want easy access to all different biomes, but you don't want to leave your house? Make the biomes come to you. Build large glass domes with a biome inside of every dome.
 * Treasure Chamber: You may not have noticed yet, but you can place Coins, Bars and Gems. Although generally a waste to do so, this can be used to make a great looking treasure chamber.
 * Atlantis: Yet another popular construction. You can build cities basically everywhere. Below the ground, in the skies, but also underwater. This is one of the more difficult constructions to build, as you tend to drown, you move slow underwater and it is dark. Furthermore, you properly want to drain the water out of your constructed building, while still allowing you to easily enter this. Luckily there are solutions to all those problems. For building underwater you properly want to use Gills Potion. If you are already further into the game you can find a Neptune's Shell, allowing you to breath permanently underwater, while also allowing you to move freely. To provide you with light you can use a Fairy Bell or similar items. To drain the water you only need a single Lava Bucket. Build a small enclosed space at the bottom of your house, remove the water inside with empty buckets and build some furniture inside. After that pour the bucket of lava in it and let the water flow in. The furniture will prevent Obsidian from being generated, causing all the water to disappear. To allow entrance, without buildings being flooded make an entrance from below using Platforms.
 * Sky Tower: Build a tower reaching all the way into space. Make sure to use different themes at different heights for a great look.
 * Museum: There are many items to display in Terraria. For example you can make rooms to display Statues, Paintings, Trophies, Armors, Banners, Butterflies and other Critters.
 * Pixel Art: An alternate way of decorating your world, which is very popular in servers. Using different colored blocks (and/or paints), you can make sprites inside your world. Try making your own character too! Gemspark blocks will work better, especially if you want your creation to be visible in the dark.