Gameplay

The gameplay of 62studio's games is generally consistent across the main games (Lust Grimm, Lust Friend, Succubus Puttel, Succubus in Wonderland). The side games, such as Cow Girl Ending and Lust Memory, have more divergent gameplay, which is described on the articles for these games.

General
The world map consists of a series of interconnected 2D maps, populated by a wide range of NPCs. Text appears above the heads of important NPCs and above entrances to important buildings, as shown in the image to the right.

Treasure chests of various colours can be found throughout the world. In Lust Grimm, the colours are brown, red, blue, green and silver, in ascending order of rarity. The rarer colours of chests also contain more valuable loot. A few of the red chests are actually Mimics in disguise, and attempting to open them instead draws the player into an inescapable battle. The contents of green chests refill whenever the player sleeps in their bed in the Outset House. Silver chests cannot be opened by default, requiring the player to consume one Silver Key to open them. In Lust Friend and subsequent games, there are only three colours of chests: blue (contain muni, the game's currency), red (contain items) and gold (contain rare items). Red chests in Lust Friend may still be Mimics in disguise.

In addition to chests, items can be found on the world map by examining objects. In Lust Friend and subsequent games, these are highlighted by a sparkling effect.

Enemies
Enemies are represented on the map by generic succubus sprites and normally roam around randomly. In Lust Grimm, each enemy has a number above its head, ranging from 1 to 4. Higher numbers indicate that an enemy is more powerful than average for the area and/or is higher in level than the player (should this be the case). Enemies are invisible from a distance and gradually become visible as the distance from them to the player decrease. In Lust Friend, the number is instead the enemy's level, allowing the player to better gauge the enemy's strength. In Succubus Puttel and subsequent games, there is no longer a number but each enemy now has a unique sprite, allowing the player to recognise them without needing to initiate battle.

When the player gets close to an enemy, they will be alerted (shown by an exclamation mark above their head) and pursue the player in an attempt to make contact and initiate battle. In Lust Grimm (but not any of the other games), the player will get a free turn at the start of battle if they contact an enemy's back; the opposite occurs if the enemy does this to the player. In Lust Memory, contact with an enemy instead causes them to drain 1 level from the main character. Bosses are represented by a different sprite from generic enemies. They also do not move and do not have a number above their heads. Battle is initiated when the player attempts to talk to a boss. When first encountered, bosses are typically positioned so that they block access to an area behind them (which may contain treasure chests), requiring the player to defeat them to gain access to this area. Succubus Puttel is a notable exception in that most of its bosses do not block the way and are technically optional; however, defeating them all is a prerequisite for the True End.

After they are defeated for the first time, bosses disappear from the map. However, there are ways to refight a boss (outside of the Succubus House), which differ depending on the game. In Lust Grimm, the player must first reach the Normal End. In Lust Friend, the bosses can be refought immediately, though their sprites are in slightly different locations to avoid blocking the way. In Succubus Puttel, a portal-like object appears near the boss' location, which allows the player to use up a Rematch Ticket to refight the boss.

Menu
The menu can be accessed at any time from the world map. The options available vary among games, but recurring options are "Item", "Skill", "Equipment", "Status", "Achievement", "Settings" and "End Game" (from top to bottom). Lust Friend and subsequent games add a "Save" option, allowing the player to save in the menu. Succubus in Wonderland has an additional "Skill Learning" option, which allows the main character to learn new skills. At the right of the screen is an summary of the player character's (player characters', in Succubus in Wonderland) status. Additional information, such as the player's muni, is shown at the bottom left or bottom right of the screen. The "Item" menu displays the player's inventory and is further split into four categories. The names of these categories vary, but they are: consumable items, enemy drops and other miscellaneous items; weapons; armour and accessories; and key items. The "Skill" menu displays the skills that the player has learned. Here the player can view the costs and descriptions of the skills. The menu is split into the categories of "Hand", "Mouth" and "Special". Some Special skills, such as "Deep Breath" and "Meditate", can be used in this menu. The "Equipment" menu is used to view and change the player character's equipment. On the left are the stats while on the right is their current equipment. Above the latter are three options: "Change Equip" (naturally used to change equipment), "Optimize" (automatically chooses equipment that results in the maximum stats) and "Unequip All" (unequips all equipment). When "Change Equip" is used, selecting a given piece of equipment will cause the list of stats on the left to display any changes that would occur from equipping it: red numbers indicate an increase in a stat and blue or green numbers indicate a decrease in a stat.

The "Status" menu shows the character's Race (meaningless in games prior to Succubus in Wonderland), Level, current and maximum Vigor, current and maximum Stamina, current EXP and EXP needed to reach the next level, stats and current equipment. There are six stats: Skill (affects damage dealt by Hand and Thrust skills), Endurance (affects damage received from Hand skills), Dexterity (affects damage dealt by Mouth skills), Spirit (affects damage received from Mouth skills), Speed (determines turn order) and Luck (affects chance-based events like item drops).

The "Achievement" menu shows all the Achievements obtained by the player. In Lust Grimm, these are shown in the order that they were obtained, along with the date and time they were obtained. The "Settings" menu allows the player to change aspects of gameplay. The aspects that can be changed vary among games, but typically include things like auto-running and sound volume. The "End Game" menu has three options: the first ends the game and returns the player to the title screen, the second ends the game and closes the game window, and the third returns the player to the main menu. In Succubus in Wonderland, only the first and third of these options are available.

Battle
Battles are typically one-on-one duels between Magrut and a single enemy (some enemies are in fact two individuals, such as Cow Girl Sisters, but these function as one enemy). Lust Friend features some battles in which the player is pitted against two distinct enemies. Succubus in Wonderland allows the player to fight in a party of two: the main character and one succubus ally. Battle is turn-based: the player chooses and performs an action, then the enemy performs their action. The basic mechanics are similar to other turn-based role-playing games, but with different names that reflect the sexual nature of combat in the setting.

The player has three meters. Vigor (shown by an orange bar), represents how much the player can endure before reaching orgasm (functioning like "Health" or "HP" in other games). It is depleted as the player takes damage, and replenished by using skills, items or certain other actions. Stamina (shown by a blue bar) is analogous to "Mana" or "MP" in other games and is consumed by using most skills. It is replenished by using certain skills or items, or (in Lust Memory) at the end of each turn. Tension (shown by a green bar), increases as the player deals or receives damage and is consumed by special skills. Enemies also have an Vigor meter, shown in the lower half of their sprite, but not Stamina or Tension. Lust Friend does not include the Tension gauge. In Succubus in Wonderland, the Tension gauge is replaced by the "Reason" gauge, which has a value of 100 at the start of battle and is depleted by enemy attacks. The main character is weakened if their Reason reaches 0, while the ally will attack the main character if their own Reason reaches 0.

The three basic options in battle are "Fight", "Run" and "Log". Selecting "Fight" brings up another menu which is used for actually fighting the enemy. "Run" causes the player to try and escape the enemy, though this is not certain to succeed. "Log" brings up a log of all text in the battle. The menu accessed by choosing "Fight" contains the options "Hand", "Mouth", "Special", "Resist" and "Item". Lust Grimm and Succubus in Wonderland also have a "Caress" option, analogous to "Attack" in other games. This does minor damage to the enemy without consuming any Stamina or Tension (in fact, it replenishes both). "Hand" and "Mouth" bring up submenus containing sexual techniques using the hands and mouth, respectively. "Special" comprises a list of skills, some of which require Tension to use. "Resist" causes the player to attempt to endure the pleasure being inflicted by the enemy, reducing damage received for one turn. "Item" allows the player to use an item.

Damage follows a system of elements, like other games, but again with a sexual theme. The player and enemies use two different but overlapping sets of elements. Player attacks can have the elements of Chest, Ass, Mouth and Pussy. Enemy attacks can have the elements of Chest, Ass, Mouth, Hand, Foot and Pussy. Some attacks possess multiple elements or are non-elemental. Most enemies are weak to one or more elements (receiving additional damage from these) and/or resistant to one or more elements (receiving less or sometimes zero damage from these). The player has access to a set of skills that temporarily boost their resistance to one element. In Lust Grimm, the player also has access to the Tentacle element via an item, and enemies can also resist certain elements. An important battle mechanic are Holds, which represent the enemy physically restraining the player in some manner. These greatly reduce the damage dealt by the player, prevent certain skills being used (resulting in them being greyed out in the menu) and grant the enemy access to new attacks. Holds are accompanied by a graphic appearing somewhere on the screen and, in some cases, a change in the enemy's sprite. To escape from a hold, the player must use Struggle (a Special skill only accessible during a Hold). The player cannot put enemies in Holds.

There are a number of status effects which both the player and the enemy can be inflicted with. As with the rest of the battle system, these are generally sexual in nature. One recurring example is "Undress", which is literally the state of being naked. This status increases damage dealt and received and also grants access to new skills, fitting the idea of clothing no longer hindering sex acts.

Beginning with Succubus Puttel, enemies reduced to half of their maximum Vigor will try to tempt the player. The player has the offer of accepting or rejecting this temptation. If the player accepts, the enemy does immense damage to them (inevitably enough to reduce their Vigor to 0) and drains 1 level. If the player rejects the temptation, nothing further happens. Temptation is counted separately from the enemy's action for that turn.

When the player reduces an enemy's Vigor to 0, they win. They obtain experience (potentially leading to an increase in Level), Muni, and sometimes items dropped by the enemy.

When the main character's Vigor is reduced to 0, it is restored to 50% of maximum and the player may continue fighting. If it reaches 0 again, it is restored to a lower percentage (33%). However, in Succubus Puttel and subsequent games, the enemy will become stronger after this occurs. The main character must therefore be reduced to 0 Vigor three times for the player to lose the battle. In Lust Grimm and Lust Memory, the player does not benefit from these free heals and will lose upon reaching 0 Vigor once. In Succubus Puttel, the player does not lose if an ally's Vigor reaches 0, but that ally will no longer be able to fight in that battle.

After losing, the player is then given the option of viewing a scene in which the victorious enemy rapes the main character. Regardless of what choice is made, this is followed by waking up back at the Outset House with Energy and Stamina fully restored. The player will now have a memory of losing to that enemy. In subsequent fights, that enemy type will have a permanent positive effect, while the player will randomly be inflicted by a negative status (though this will only last a few turns). Should the player lose again, they will experience a different scene. In Lust Friend and subsequent games, the second scene results in the main character permanently submitting to that enemy, though this does not prevent the player from continuing.

Lust and Dependence
Lust and Dependence are two different ways in which the game represents the main character slowly giving in to the temptations of the succubi. Lust is present in multiple games, while Dependence has only appeared in Lust Grimm.

Lust is a percentage it increases when the player is attacked, attempts but fails to break out of a hold, flees a battle, steps in Suspicious Liquid (Lust Grimm only), uses certain items or experience certain sexual events. The higher the Lust value, the more damage the player receives and the more difficult it is for them to break out of a hold or escape battle. Enemies often have attacks that are only used when Lust is above a certain threshold. At 100% Lust, it becomes completely impossible to escape holds. Lust can be decreased by using certain items, using the services of a Suspicious (Lust Grimm only), losing to any enemy (the latter two reduce it to 0%), saving or sleeping in a bed (the latter two are unique to Succubus Puttel).

Dependence ranges from 0 to 100. It only increases when the player loses to an enemy. Dependence can only be decreased in three ways: by using a Suspicious Mage (only removes one point), using a Grimm Potion in a specific location, or allowing it to reach 100 (which causes it to return to 0). Unlike Lust, Dependence has no negative effects until it reaches 100, though the player will receive warnings as it exceeds certain thresholds. Once Dependence reaches 100, the player will be transported to a strange otherwordly location and attacked by succubi, resulting in a unique rape scene and the game's Dead End. Contrary to what the name may suggest, this is not a Game Over; the player will respawn at the Outset House, but with their Level reset to 1.