1key, Terraria game, item, collectible, dungeon, floating island, chest, loot, skeleton, slime, boss drop, crafting, NPC, guide, biome, underground, corruption, crimson, jungle, ice, desert, hallowed, mimic, light, night, adventure, pixel art, vibrant colors, torch light, exploration, side-scrolling, 2D, action-packed, multiplayer, single-player, sandbox.