but most of these disappear with the Romancing SaGa games, providing a unique gameplay experience. It also features a similar turn-based battle system, where a character's prowess is driven by numerical values called "statistics" which, in turn, increase with combat experience. Given the open-ended aspect of gameplay and the ability to play through multiple character scenarios, heavy emphasis is placed upon the replay value of SaGa games. Since the original Makai Toushi SaGa, much of the series has relied on loosely connected stories and sidequests rather than an epic narrative. Makai Toushi SaGa allowed players to travel through different worlds. Romancing SaGa expanded the open-endedness by offering many choices and allowing players to complete quests in any order, with the decision of whether or not to participate in any particular quest affecting the outcome of the storyline. The game also allowed players to choose from eight different characters, each with their own stories that start in different places and offer different outcomes. Romancing SaGa thus succeeded in providing a very different experience during each run through the game, something that later non-linear RPGs such as SaGa Frontier and Fable had promised but were unable to live up to. It also introduced a combo system where up to five party members can perform a combined special attack, and required characters to pay mentors to teach them abilities, whether it is using certain weapons or certain proficiencies like opening a chest or dismantling a trap. While in the original Romancing SaGa, scenarios were changed according to dialogue choices during conversations, Romancing SaGa 2 further expanded the open-endedness by having unique storylines for each character that can change depending on the player's actions, including who is chosen, what is said in conversation, what events have occurred, and who is present in the party. Romancing SaGa 3 featured a storyline that could be told differently from the perspectives of up to eight different characters and introduced a level-scaling system where the enemies get stronger as the characters do, a mechanic that was later used in Final Fantasy VIII, The Elder Scrolls IV: Oblivion, Silverfall, Dragon Age: Origins, Fallout 3, and The Elder Scrolls V: Skyrim. SaGa Frontier further expanded on the non-linear gameplay of its Romancing SaGa predecessors, with a setting that spans multiple planets and an overarching plot that becomes apparent after playing through each of the different characters' quests that tie together