Long ago, two races ruled over the Earth: Humans and Monsters. If the player quits or resets the game, these characters comment on the player's past action, or have a sense of familiarity from past playthroughs. For the latter, almost every major character possesses meta-knowledge. This ranges from minor options, killing and sparing monsters, and the SAVE feature. The dialogue and locations can be drastically altered based on the player's actions. Undertale features witty and humorous dialogue, with occasional fourth wall breaks. Unlike traditional RPGs, grinding, backtracking, and the few sidequests are all optional. In this situation, the player is required to grind encounters to progress the game. However, if the player decides to kill every monster they can find, many puzzles are disabled. Battles can also be seen as puzzles, as it can require the right set of ACTs to resolve the fight peacefully. The overworld mostly consists of puzzles that the player must solve to progress. Unlike traditional RPGs, it is possible to complete Undertale without killing monsters. Undertale emphasizes on the morality of killing and sparing the Monsters encountered, as the player's actions determine the ending. Killing an enemy rewards EXP and LV, but neither are given if an enemy is successfully spared. At the end of the battle, GOLD is earned. If certain conditions are met, MERCY can be selected to spare the enemy, which ends the combat. Using an item can benefit the protagonist. Selecting an ACT can change the opponent's mood, or reveal information on the enemy. FIGHT damages the opponent with a quick-time event. SOUL modes alters the SOUL's color and how it functions in a battle, and is often used during a Boss battle.ĭuring the protagonist's turn, they can use one of the four options per turn: FIGHT, ACT, ITEM, and MERCY. Attacks can be in different colors, some of which can heal the SOUL or be an obstacle. As the game progresses, new elements are introduced in the form of Attack Types and SOUL Modes. The Player must move the protagonist's SOUL, represented by a red heart, to avoid attacks. During the enemy's turn, they attack with bullet hell patterns. The battle system in Undertale is turn-based. The player, represented by the red heart icon, evading enemy attacks. Undertale is a role-playing game that utilizes many genre mechanics, mechanics, albeit differently.

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