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20 Side Dice

By Ashley

October 30, 2025

3 min read

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20 Side Dice

Dice games have been a staple of entertainment for centuries, offering a blend of luck and strategy that keeps players engaged. Among the various types of dice games, those involving 20 side dice stand out for their complexity and the wide range of outcomes they offer. These dice, also known as icosahedral dice or d20s, are particularly popular in role-playing games (RPGs) like Dungeons & Dragons, where they determine the success or failure of actions, the outcome of battles, and the resolution of quests.

Table of Contents

Understanding 20 Side Dice

20 side dice are polyhedral dice with 20 faces, each numbered from 1 to 20. The design of these dice allows for a broader range of outcomes compared to standard six-sided dice, making them ideal for games that require more nuanced results. The shape of a d20 is an icosahedron, a geometric figure with 20 triangular faces. This unique shape not only adds to the aesthetic appeal but also ensures that each face has an equal probability of landing face up.

The Role of 20 Side Dice in Role-Playing Games

In RPGs, 20 side dice are used extensively to determine the outcome of various actions. Players roll the dice to see if their characters succeed in tasks such as attacking an enemy, casting a spell, or solving a puzzle. The game's rules often specify a target number that the player must meet or exceed with their roll. For example, in Dungeons & Dragons, a player might need to roll a 15 or higher on a d20 to successfully cast a spell. The use of 20 side dice adds an element of unpredictability and excitement to the game, as even the most skilled characters can sometimes fail due to a poor roll.

Types of 20 Side Dice

While the standard 20 side dice are numbered from 1 to 20, there are variations that cater to different gaming needs. Some dice are designed with specific themes or colors to match the aesthetic of a particular game or campaign. Additionally, there are weighted dice that are designed to favor certain outcomes, although these are generally frowned upon in competitive gaming environments. Here are some common types of 20 side dice:

Standard d20 Dice: These are the most common type, with faces numbered from 1 to 20. They are used in a wide variety of RPGs and board games.
Themed d20 Dice: These dice come in various designs and colors to match the theme of a game or campaign. For example, a fantasy-themed d20 might have runes or magical symbols on the faces.
Weighted d20 Dice: These dice are designed to favor certain outcomes, such as rolling higher numbers more frequently. They are generally not recommended for use in competitive games.

How to Use 20 Side Dice in Games

Using 20 side dice in games involves understanding the rules of the specific game you are playing. Here are some general steps to follow:

Read the Rules: Familiarize yourself with the game's rules regarding dice rolls. Understand what actions require a dice roll and what the target numbers are.
Roll the Dice: When it's your turn to act, roll the 20 side dice and see the outcome. The result will determine whether your action is successful or not.
Apply Modifiers: Some games allow for modifiers to be added to the dice roll. These can be based on the character's skills, abilities, or other factors. For example, a character with a high strength might get a +3 bonus to their attack roll.
Determine the Outcome: Compare the result of the dice roll to the target number. If the roll meets or exceeds the target number, the action is successful. If not, the action fails.

📝 Note: Always ensure that the dice you are using are fair and unbiased. Weighted dice can ruin the integrity of the game and lead to disputes among players.

Popular Games Using 20 Side Dice

20 side dice are used in a variety of games, but they are particularly popular in RPGs. Here are some of the most well-known games that utilize 20 side dice:

Dungeons & Dragons: This classic RPG uses 20 side dice for a wide range of actions, from combat to skill checks. The d20 system is central to the game's mechanics, making it a staple for many players.
Pathfinder: Similar to Dungeons & Dragons, Pathfinder uses 20 side dice for determining the outcome of actions. The game is known for its detailed rules and complex character customization.
Warhammer Fantasy Roleplay: This game uses 20 side dice for various actions, including combat, skill checks, and magic use. The game is set in a dark and gritty fantasy world, adding to the immersive experience.

Benefits of Using 20 Side Dice

There are several benefits to using 20 side dice in games. Some of the key advantages include:

Increased Variety: With 20 possible outcomes, 20 side dice offer a wider range of results compared to standard six-sided dice. This adds depth and complexity to the game.
Enhanced Strategy: The broader range of outcomes allows for more strategic gameplay. Players must consider the probabilities of different rolls and plan their actions accordingly.
Immersive Experience: The use of 20 side dice adds to the immersive experience of RPGs. The unpredictable nature of the rolls makes each game session unique and exciting.

Tips for Choosing the Right 20 Side Dice

When choosing 20 side dice for your games, consider the following tips to ensure you get the best quality and performance:

Material: Look for dice made from high-quality materials such as plastic or metal. These materials are durable and provide a good rolling experience.
Balance: Ensure that the dice are well-balanced. A balanced die will roll more fairly and provide consistent results.
Design: Choose a design that matches the theme of your game. Themed dice can add to the immersive experience and make the game more enjoyable.
Reviews: Read reviews from other players to get an idea of the dice's quality and performance. This can help you make an informed decision.

📝 Note: Avoid using dice that are too light or too heavy, as this can affect their rolling performance and fairness.

Common Misconceptions About 20 Side Dice

There are several misconceptions about 20 side dice that can lead to misunderstandings and disputes among players. Here are some common myths debunked:

Weighted Dice Are Fair: Weighted dice are designed to favor certain outcomes, making them unfair for competitive gaming. Always use unbiased dice for a fair game.
Rolling Techniques Matter: The way you roll the dice does not affect the outcome. The dice should be rolled in a way that allows them to land randomly on any face.
Dice Can Be "Hot" or "Cold": The concept of dice being "hot" (rolling high frequently) or "cold" (rolling low frequently) is a myth. Each roll is independent, and the dice do not have memory.

Maintaining Your 20 Side Dice

To ensure that your 20 side dice last a long time and perform well, follow these maintenance tips:

Store Properly: Keep your dice in a cool, dry place away from direct sunlight and moisture. This will prevent warping and discoloration.
Clean Regularly: Clean your dice regularly to remove dirt and oils that can affect their rolling performance. Use a soft cloth and mild soap to clean the dice.
Avoid Dropping: Dropping the dice from a high height can cause them to crack or chip. Always handle them with care.
Inspect for Damage: Regularly inspect your dice for any signs of damage, such as cracks or chips. Replace any damaged dice to ensure fair gameplay.

📝 Note: Avoid using abrasive materials to clean your dice, as this can scratch the surface and affect their appearance.

Advanced Techniques with 20 Side Dice

For experienced players, there are advanced techniques that can be used with 20 side dice to add more depth and strategy to the game. Some of these techniques include:

Critical Rolls: In many RPGs, rolling a natural 20 on a d20 is considered a critical success, while rolling a natural 1 is a critical failure. These rolls can have significant effects on the game, such as dealing extra damage or causing a catastrophic failure.
Exploding Dice: Some games use the concept of exploding dice, where if a player rolls the maximum value (20), they get to roll again and add the result to the original roll. This can lead to very high rolls and exciting outcomes.
Multiple Dice Rolls: In some games, players may need to roll multiple 20 side dice and add the results together. This can be used for actions that require a higher degree of success, such as complex skill checks or powerful spells.

20 Side Dice in Other Games

While 20 side dice are most commonly associated with RPGs, they are also used in other types of games. Here are some examples:

Board Games: Some board games use 20 side dice to determine the outcome of various actions, such as moving pieces or resolving conflicts.
Card Games: In some card games, 20 side dice are used to add an element of chance to the gameplay. For example, a player might need to roll a d20 to see if a special ability activates.
Wargames: Wargames often use 20 side dice to simulate the unpredictability of combat. The dice rolls can determine the outcome of battles, the movement of troops, and other strategic decisions.

Creating Your Own 20 Side Dice Game

If you're feeling creative, you can design your own game using 20 side dice. Here are some steps to help you get started:

Conceptualize the Game: Come up with a unique concept for your game. Think about the setting, the characters, and the objectives.
Define the Rules: Establish the rules for how 20 side dice will be used in the game. Determine what actions require a dice roll and what the target numbers are.
Create Characters: Develop characters for the game, including their abilities, skills, and attributes. These will affect how the dice rolls are interpreted.
Test the Game: Playtest your game with friends or family to see how it works in practice. Make adjustments based on their feedback.
Refine the Rules: Based on the playtesting, refine the rules to ensure they are clear, fair, and enjoyable.

📝 Note: Be open to feedback and willing to make changes to improve the game. The best games are often the result of iterative development and testing.

20 Side Dice in Educational Settings

20 side dice can also be used in educational settings to teach various concepts, such as probability and statistics. Here are some ways to incorporate 20 side dice into the classroom:

Probability Lessons: Use 20 side dice to teach students about probability. Have them roll the dice multiple times and record the results to see how often certain numbers come up.
Data Analysis: Collect data from dice rolls and use it to teach students about data analysis and statistics. They can create graphs, charts, and other visual aids to represent the data.
Game Design: Encourage students to design their own games using 20 side dice. This can help them understand game mechanics, rules, and strategy.

Incorporating 20 side dice into educational activities can make learning more engaging and interactive, helping students to better understand complex concepts.

20 Side Dice in Competitive Gaming

While 20 side dice are often used in casual gaming environments, they can also be used in competitive settings. Here are some tips for using 20 side dice in competitive games:

Use Fair Dice: Ensure that the dice used in competitive games are fair and unbiased. Weighted dice can give an unfair advantage and ruin the integrity of the game.
Establish Rules: Clearly define the rules for dice rolls, including what actions require a roll and what the target numbers are. This ensures that all players are on the same page.
Monitor Rolls: Have a neutral party monitor the dice rolls to ensure fairness. This can help prevent disputes and ensure that the game runs smoothly.
Use Multiple Dice: In some competitive games, players may need to roll multiple 20 side dice and add the results together. This can add an extra layer of strategy and excitement to the game.

📝 Note: Always prioritize fairness and integrity in competitive gaming. Using biased dice or manipulating the rules can lead to disputes and a negative gaming experience.

20 Side Dice in Fantasy and Science Fiction

20 side dice are often featured in fantasy and science fiction settings, adding to the immersive experience of these genres. Here are some examples of how 20 side dice are used in these contexts:

Fantasy RPGs: In fantasy RPGs, 20 side dice are used to determine the outcome of magical spells, combat actions, and other fantastical events. The unpredictable nature of the rolls adds to the excitement and unpredictability of the game.
Science Fiction RPGs: In science fiction RPGs, 20 side dice can be used to simulate advanced technology, alien encounters, and other futuristic elements. The dice rolls can determine the success or failure of actions such as hacking a computer system or piloting a spaceship.
Themed Dice: Themed 20 side dice can add to the immersive experience of fantasy and science fiction games. For example, a fantasy-themed d20 might have runes or magical symbols on the faces, while a science fiction-themed d20 might have futuristic designs.

Incorporating 20 side dice into fantasy and science fiction games can enhance the immersive experience and make the game more engaging for players.

20 Side Dice in Historical and Period Games

20 side dice can also be used in historical and period games to simulate the unpredictability of historical events. Here are some ways to incorporate 20 side dice into these types of games:

Historical RPGs: In historical RPGs, 20 side dice can be used to determine the outcome of battles, political intrigue, and other historical events. The dice rolls can add an element of unpredictability and excitement to the game.
Period Games: In period games, 20 side dice can be used to simulate the challenges and opportunities of a specific historical period. For example, in a game set during the Victorian era, the dice rolls might determine the success of a social event or a business venture.
Historical Accuracy: When using 20 side dice in historical and period games, it's important to maintain historical accuracy. The rules and outcomes should be based on real historical events and data.

Incorporating 20 side dice into historical and period games can make the game more engaging and educational, helping players to better understand the complexities of history.

20 Side Dice in Horror and Mystery Games

20 side dice can add a thrilling element to horror and mystery games, where the outcome of actions can be unpredictable and often terrifying. Here are some ways to use 20 side dice in these genres:

Horror RPGs: In horror RPGs, 20 side dice can be used to determine the success or failure of actions such as escaping a haunted house, solving a mystery, or surviving an encounter with a supernatural entity. The unpredictable nature of the rolls adds to the tension and fear.
Mystery Games: In mystery games, 20 side dice can be used to simulate the challenges of solving a crime or uncovering a secret. The dice rolls can determine the success of actions such as gathering clues, interrogating suspects, or piecing together evidence.
Atmosphere: Themed 20 side dice can enhance the atmosphere of horror and mystery games. For example, a horror-themed d20 might have eerie symbols or spooky designs, while a mystery-themed d20 might have detective-themed designs.

Incorporating 20 side dice into horror and mystery games can make the experience more immersive and thrilling, keeping players on the edge of their seats.

20 Side Dice in Cooperative Games

Cooperative games often rely on teamwork and strategy to achieve a common goal. 20 side dice can add an element of chance and unpredictability to these games, making them more exciting. Here are some ways to use 20 side dice in cooperative games:

Teamwork: In cooperative games, 20 side dice can be used to determine the success of team actions. For example, players might need to roll a certain number to successfully complete a task or overcome an obstacle.
Communication: The use of 20 side dice encourages communication and coordination among players. They must work together to decide the best course of action and support each other’s rolls.

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