SaGa: Scarlet Grace is a 2016 role-playing video game developed by Square Enix and Studio Reel and published by Square Enix for the PlayStation Vita. It is the twelfth entry in the SaGa series. An expanded port subtitled Ambitions was released in 2018 in Japan and in 2019 worldwide for Android, iOS, Nintendo Switch, PlayStation 4 and Windows. The story follows four characters pursuing separate missions across the splintered remains of a dissolved Empire; central to the plot is the Firebringer, a rebellious deity defeated during the Empire's height. Gameplay focuses on the protagonists exploring the nonlinear world, taking part in turn-based battles where skill growth depends on chosen actions.

The game was the series' first original console title since 2002's Unlimited Saga, with development beginning in 2013 to celebrate the series' 25th anniversary. Returning staff included series creator Akitoshi Kawazu as co-designer and scenario writer, artist Tomomi Kobayashi, and composer Kenji Ito. The team designed several aspects of the game based on player feedback from Unlimited SaGa, and incorporated features from both SaGa Frontier and the Romancing SaGa games. Ambitions began development following Scarlet Grace, with improvements based on feedback from the original. The Western version was localised by 8-4. Reception of the game was generally positive, with critics praising its gameplay and design.

SaGa: Scarlet Grace is a role-playing video game in which players take control of four different protagonists through separate scenarios; each character can pick up a group of followers, with up to four joining them in battle. Prior to starting the game, the player is asked a series of questions; the answers allow the game to recommend which character to start with and impact their statistics. The core narrative is advanced by completing events on the game's world map; these events range from battles to story-based interactions with non-playable characters (NPCs). Due to the nonlinear gameplay of Scarlet Grace, events can be completed in any order or ignored entirely, with which events are completed impacting the narrative and later events.

The world map—divided into provinces—is represented using two-dimensional (2D) artwork, while the chosen protagonist is represented using a three-dimensional (3D) model. The types of events present are towns which house story events and vendors such as merchants and blacksmiths, transport points to different areas of the world, and battles of varying difficulty. The protagonist can also engage in "Production", a side activity where the player can initiate trade between the worlds' different regions. Taking part in Production rewards the player with materials to use in crafting. Prior to triggering a battle, the enemy's strength and loot are displayed.

Once a battle is triggered on the world map, the player and enemy parties face each other in a themed arena. Battles use a turn-based combat system, with each side able to perform an action per turn. The player's party is arranged in different formations which impact their abilities and tactics. Their actions are dictated by Battle Points (BP), displayed as a line of stars; depending on the amount of available BP, different actions can be taken, and those characters who cannot be assigned a move skip that turn. There are eight weapon types, each with different attributes which impact both how a character fights, how they attack different enemies, and the effectiveness of attacks against enemy types.

Each character has access to battle abilities called Techniques which cost BP to execute. During battle, player and enemy actions are displayed along the bottom of the screen as a "Timeline". Some Techniques can alter the flow of the Timeline, and some attacks can knock an enemy back, pushing their action further down the Timeline. If all characters are adjacent on the Timeline following the end of a turn, a United Attack is triggered, allowing all characters to attack. A United Attack allows actions for the next turn to cost less BP, with the amount of BP reducing further if stronger characters took part and dealt higher damage.

Each party member has health points (HP) and Life Points (LP). HP can be replenished in battle using items and varieties of healing magic, but LP cannot be replenished unless a party member is not in battle. Once a character's LP is depleted, they cannot be used in battle, with LP recovering at the rate of one LP every two completed battles. LP can also be restored in towns in exchange for materials. If the party loses all HP during a battle, the game ends. The player party can also be granted "Benison", boons gifted by the world's deities that can remove status effects, heal the party, or aid them with attacks. Activating a Benison cancels all the party's moves for one turn.

As with previous SaGa titles, raising a character's statistics and acquiring new or more powerful skills is not tied to an experience point-based leveling system. After each battle, a particular statistic is raised based both on the battle's events and which weapons and abilities were used by any particular party member. Using a Technique enough upgrades it to become more powerful, while new Techniques are unlocked by using similar Techniques. Techniques have five levels, with each level yielding more powerful effects. Weapons have a similar system, where Weapon Skills—battle actions tied to weapons—can raise their rank through usage to become more effective and cost less BP to execute, or unlock new Skills. Many Skills and ranks are tied to specific weapons. After completing each battle, players are awarded with weapons, armor, accessories and materials. Weapons and armor can be strengthened using specific materials, with the rank of blacksmiths increasing the quality of the upgrade.