Like previous installments in the Tales series, Tales of Symphonia consists primarily of three major areas: an overworld field map, town and dungeon maps, and a battle screen. The overworld map is a 3D model, featuring a scaled-down version of the game's fictional world which the player travels through to reach the game's locations. As with preceding games in the series, the world map can be traversed by foot, on the party's quadrupedal pet Noishe, and on flying vehicles known as Rheairds. On field maps, characters are directed across realistically scaled environments. The battle screen is a 3D representation of an area, in which the player commands the characters in battles against CPU-controlled enemies.
On the overworld and field maps, various skits between the characters can be viewed. They involve animated character portraits, subtitles, and, in the Japanese version, full voice acting. Skits concern anything from character development to side details. Overworld map skits affect Lloyd's relationships with other party members. The player will be able to make certain decisions that imperceptibly affect how the other characters think of Lloyd. Some of these choices have minor ramifications for the game's storyline.
Battle system
During battle sequences, the game uses the Multi-Line Linear Motion Battle System. Four characters from the party are chosen to battle; those not controlled by a player are guided by artificial intelligence with instructions set by the player beforehand. Damage dealt to the opponent fills a "Unison Gauge". When this is full, a "Unison Attack" can be triggered, allowing the party to use techniques simultaneously on a single enemy. When certain techniques are combined, a special attack results in additional damage.
After battle, a currency called Grade is awarded or subtracted based on specific criteria that are fulfilled in battle. It is used to purchase bonuses during New Game Plus. Players are also prompted to cook food after battles if they have the materials. Cooking recipes determine the benefits received such as health recovery. The degree of the benefit is determined by which character is chosen to cook.
Tales of Symphonia's skill system is built around the use of "EX Gems", which come in four ranks. Each character can equip up to four EX Gems and set abilities to those gems. The abilities determine if the characters will learn Strike or Technical techniques and spells. Combinations of EX Gem abilities can also grant additional abilities called "EX-Skills". The development of a character's attributes is determined by their equipped "Title". Titles are earned through story progression, side quests, or completion of miscellaneous criteria.
Plot
Lloyd Irving and his friend, Genis Sage accompany the chosen, Colette Brunel and her guardians, Raine Sage and Kratos Aurion on her journey of world regeneration. The purpose of the journey is to replenish Sylvarant with mana, a necessary energy to their survival.NGC The path of the journey consists of five temples which must be unsealed by Colette. On their journey, they meet Sheena Fujibayashi who comes from Tethe'alla, a world parallel to Sylvarant. She tells them about how the two worlds vie for each other's mana through the journey of regeneration.NGC Hoping to find answers from the angel Remiel, the party meets him at the final seal and are betrayed by Remiel and Kratos; both are revealed to be part of Cruxis, an evil organization led by Mithos Yggdrasill.
The party leaves for Tethe'alla to search for a way to save both worlds and are joined by Zelos Wilder, Presea Combatir, and Regal Bryant. The party learns that awakening the Summon Spirits in both worlds will sever the mana tie between them.NGC Believing that to be the answer, they successfully sever all mana ties between the two worlds.NGC Their actions instead destabilize the Great Seed, the supplier of mana to both worlds, causing it to grow and engulf Sylvarant at an exponential rate.NGC After the party re-stabilizes the seed, they learn from Yuan Ka-Fai about the origins of Sylvarant and Tethe'alla and how they used to be one world but was split by Mithos with the Eternal Sword; the party realizes they can save the world if they wield the Eternal Sword, merge the worlds, and germinate the Great Seed. They decide to confront and defeat Mithos before seeking the Eternal Sword.
Kratos is revealed to have been gathering materials to have Lloyd use the Eternal Sword. He succeeds but Mithos survives his apparent death and possesses a member from the party before fleeing to the comet Derris-Kharlan. Mithos attempts to take the Great Seed with him but is foiled and killed by Lloyd. Using the Eternal Sword, Lloyd merges Sylvarant and Tethe'alla together and germinates the Great Seed into a Giant Kharlan Tree to supply the world with mana.NGC
