The battle system in Hyperdimension Neptunia is turn-based by unit, where each character's turn comes based on their speed. Characters expend AP to attack enemies. Characters will only synthesize and use items when certain conditions are met.
Ranged attacks will be affected by the elemental bullet selected. There are five elements that can be acquired: Neutral, Fire, Wind, Water, and Earth.
|Fire Bullet||Fire||Tutorial Dungeon: Monsters|
|Wind Bullet||Wind||Monster drop: Lindwurm|
|Ice Bullet||Water||Monster drop: Hot Dog|
|Grand Bullet||Earth||Monster drop: ??? (Black Heart)|
To escape, the player must have an Eject Button in the inventory. Without an Eject Button, escape is impossible.
Guard Break lasts from when the GP reaches 0 until the gauge recovers. During Guard Break, the Combo's chain will carry over. Combos will chain with others even if the player doesn't use the Combo Link or Switch systems. The Guard Break gauge will gradually recover after the enemy enters this state.
There are three types of stats present in Hyperdimension Neptunia.
The player can increase/decrease a character's basic status by leveling up. The stats of a CPU's HDD form can increase/decrease by changing the equipped Processor Units.
|Strength||The character's physical power. Affects close-combat ability.|
|Vitality||The character's willpower. Affects defensive abilities.|
|Agility||The character's speed. Affects their action turn in battle.|
|Intelligence||The character's intelligence. Affects ranged-combat ability.|
|Mentality||The character's mentality. Affects magical/ranged resistance.|
|Luck||The character's luck. Affects critical hits.|
Parameters can increase/decrease depending on the equipment a character is wearing.
Processor Unit Parameters
In addition to basic status, Processor Units have their own unique stats that are applied when a CPU is in HDD form. Processor Units also affect a CPU's elemental resistance.
|Clock Frequency||Processing ability. It affects overall CPU performance.|
|Memory||Memory ability. It affects mainly resistance.|
|Heat||Unit temperature. The higher the value, the higher your attack power.|
There are six status ailments in Hyperdimension Neptunia. Status ailments can be inflicted by enemies and characters alike. Some Item Skills can inflict a Status Ailment to a character's self or to other allies.
|Poison||HP slowly deteriorates. Character loses HP every turn.|
|Paralyze||May fall to act. Character may fail to attack during a turn.|
|Lo-Tension||Slower speed, decreased AP. Character moves slowly in turn order, but AP consumption per action is decreased.|
|Hi-Tension||Faster speed, increased AP. Character moves faster in turn order, but AP consumption per action is increased.|
|Heal||HP will slowly recover. Character will gain HP every turn.|
|Lunatic||Attack power increases, but Item Skills will not activate. Skills may become normal attacks.|
There are two types of skills in Hyperdimension Neptunia: Combo Skills and Item Skills.
- Main article: Combo Skill (Hyperdimension Neptunia)
In Hyperdimension Neptunia, a Combo Skill is a type of skill that can be assigned to a character to create attack sequences. The character may utilize up to four Combo Skills in a single sequence. If the player executes a certain combo in a sequence, the player is given a chance for a character to perform a skill called an End Bonus.
- Main article: Item Skill
An Item Skill is a type of skill a character has in Hyperdimension Neptunia. It allows a character to synthesize and use items in the heat of battle without having to waste a character's turn. The usage of an Item Skill is determined by several factors: the quantity of Item Synthesis Materials: (Tuffmil, Reflex, Gelatin, and Detoxin) currently in possession, the activation percentage, and various battle conditions.
Order is determined by each ally's speed and will be displayed with icon symbols. A cursor will point to the character taking action. The targeted enemy's icon will flash.