Undertale
When players meet enemies in either scripted events or random encounters, they enter a battle mode. During battles, players control a small red heart which represents their soul, and must avoid attacks shot by the monster(s) in a way much like a bullet hell shooter. Later the game, new types of gameplay are shown. These include blue-colored bullets that only hurt when the player is moving, or orange bullets that only hurt when staying still. Boss battles often introduce these coloured bullet mechanics. Players can use the FIGHT option to attack, which involves timed button presses. Players can also use the ACT option to do many different actions, which are different for each enemy, usually for a peaceful resolution. Players can also use the ITEM option to eat food to heal, or to put on weapons or armor. Players can also use the MERCY option to spare enemies or run away. Monsters can be spared only if they have been beaten up enough to make them weak and unable to fight, or if they have been pleased by the right actions. In order for some boss battles to be completed without involving murder, the player must survive until the character they are facing has finished their dialogue. The game has many story branches and endings depending on whether players choose to murder or spare their enemies; and as such, it is possible to clear the game without murdering a single enemy. Players earn EXP and gold for killing monsters.