All Questions
Tagged with statistics game-design
28 questions
6
votes
2
answers
1k
views
How do I calculate probability for the dice mechanic in my custom indie ttrpg?
I am currently working on writing an indie TTRPG based on the "press your luck" style games instead of being based around miniature war games.
I am struggling to understand the probabilities ...
- 61
19
votes
5
answers
3k
views
How many rolls of a D20 would you expect to equal or beat (20 - number of tries)?
I have what is chiefly a probability / game-design query, but one with a clear RPG gaming purpose behind it.
Assume I have a check in some game system, using a single 20-sided dice, that requires ...
- 405
4
votes
2
answers
238
views
How to make a good height and weight table? [closed]
I am wondering how I would make a good height and weight table that has balanced ranges across a range of around 6-8 feet. When I have tried making a table, it always ended up being too light for ...
2
votes
1
answer
501
views
Determining dice pools for given percent chances of numbers of successes
The Question
I'm working with my friend on a new (we think) dice system for a homebrew RPG (soon to hit the TTRPG world by storm, no doubt). A design goal is that players' statistical success rate at ...
- 44.7k
9
votes
1
answer
478
views
What information is available about the intended mathematics of D&D?
D&D 5e was heavily play-tested prior to its release. I have heard (but have not verified) that, at low levels, the hit rate of the attack rolls of PCs was intentionally optimized to be ...
- 3,251
4
votes
2
answers
445
views
Can I get some help on calculating damage per round in my homebrew, that mixes d20s and d6s?
I am tweaking my homebrew RPG and trying to determine various Damage Per Round through an Excel spreadsheet. Here are the details:
A single players always roll d20 system where 20 is a auto hit and 1 ...
- 91
22
votes
2
answers
3k
views
Roll Xd6, keeping highest value and adding +1 for each duplicate of that value?
I'm making a card/dice game and I'm trying to set something up on Anydice to compare the odds of the dice rolls, but I'm having some trouble wrapping my mind around some of the language Anydice uses.
...
- 15.1k
8
votes
2
answers
493
views
What is the probability distribution for CthulhuTech rolls?
I've recently learnt about CthulhuTech, which has a unique dice pool system:
CthulhuTech uses a proprietary game system known as "Framewerk" that focuses on a dice pool system. An unusual ...
- 13.7k
4
votes
1
answer
315
views
Disadvantage/adversity dice pool mechanic that knocks dice greater than 1 out of the pool and adds 1s to it
I am working on a dice pool system for skills and actions to be used in a new system.
In this system, any rolls of 1 will negatively affect the outcome of resolving an action using a dice pool.
In ...
- 43
11
votes
3
answers
1k
views
Dice rolling mechanic where modifiers have a predictable and consistent effect on difficulty
I am looking for a dice rolling mechanic that makes it such that increasing or decreasing a modifier on the roll has a constant multiplier effect on the probability of the outcome.
Say you have to ...
7
votes
8
answers
4k
views
How to handle degrees of success in roll under systems
I'm working on an RPG system that uses 2d6 roll under Skill for resolutions. On paper this system looks really good so
far, but I have one major issue: Degrees of Success, especially when it comes to ...
- 231
4
votes
2
answers
424
views
What target numbers would be a certain level of difficulty under this system?
I’m writing a homebrew game system, and I found that I have an action resolution mechanic but not a good system for target numbers (I call them Success Thresholds, or STs, in this game, and from now ...
- 4,387
4
votes
1
answer
647
views
Has anyone done research on average RPG probabilities?
I've been looking at designing an RPG system lately and I'm currently considering where to set the "difficulty" of a roll at to get some satisfying results.
I'm wondering - has anyone researched some ...
- 543
2
votes
1
answer
300
views
How do I find the odds in a dice pool contest?
I'm designing a system where overall success is determined using a dice pool where you count the number of max-value faces among dice rolled and compare this number to some difficulty number. In this ...
27
votes
10
answers
4k
views
How can the probability of a fumble decrease linearly with more dice?
I'm working on a simplified RPG system that uses only D6s, and I want a mechanic for fumbles/critical fails.
Depending on how good the player character is, they have 1-5 dice to roll and they have to ...
- 373
2
votes
1
answer
886
views
I need a dice system with a unique behavior and rate of growth (preferably in ANYDICE to verify) [closed]
I am looking for a defense system where the probability of hitting is proportional to the inverse of a quadratic polynomial with respect to defense. I don't care about attack scaling yet.
If you ...
- 21
4
votes
1
answer
1k
views
How do I count the number of duplicates in anydice?
Let's say I have the following roll: 6 6 5 5 5 4. I want to count the number of duplicates, in this case 3 (6 and ...
- 2,274
3
votes
1
answer
143
views
Modelling a custom attack resolution in AnyDice: highest non-draw die of pool
I'm experimenting with the probabilities of various "die pool" attack resolutions for a game I'm designing, knowing that pools will generally be 1-4 dice, with sacrifices to temporarily boost a die ...
- 2,274
8
votes
1
answer
711
views
What can I read about how we tie the stochastic characteristics of task resolution into statements about a game system's aesthetics?
I like making RPG systems. One thing I've noticed is that different kinds of task resolution systems make the game significantly different.
Background
For example, games like D&D 3.X and ...
- 67.9k
2
votes
0
answers
109
views
Reliable Research Resources for RPG Creation? [closed]
I'm an Ozstralian enthusiast of ALL genres of game, electronic & tabletop, but mostly here to network resources for research & rules generation for a new line of fantasy / Medieval roleplaying ...
- 59
6
votes
2
answers
682
views
Help with probability for a complicated dice pool mechanic
I'm putting together a system with experimental dice mechanics. I want to know the probabilities involved, preferably in a way such as anyDice where I can easily change all variables and get the ...
- 71
72
votes
18
answers
24k
views
What dice mechanic gives a bell curve distribution that narrows and increases mean as skill increases?
I'm looking for a dice mechanic that produces a bell curve at all skill levels. I also want it to increase accuracy and precision as a character's skill increases — this basically means better average ...
- 965
9
votes
1
answer
376
views
How are a dice pool's probabilities affected by being allowed/forced to add dice then drop high/low dice?
I'm working on a homebrew system. The base mechanic, without getting too involved on specifics, is roll a pool of d6s (1–5) and compare each vs. a target number (Generally 4–6); any that are equal to ...
- 91
33
votes
6
answers
5k
views
How many rolls does it take to get to six coins?
I'm designing a microRPG and need some help calculating probabilities so I can make an informed decision about how many coins to start with (controlling session duration and early-game frustration).
...
- 53.4k
11
votes
9
answers
5k
views
How do I approach the probability of a d100, using 2 d100's?
We're running an almost 100% homebrew system, which uses skills in order to craft objects during play. Allow me to first formulate an example to explain my question better:
Jack is quite the mason ...
- 853
5
votes
5
answers
4k
views
Calculating dice pool probability with limited rerolls
I need a probability calculation script that works with various dice and dice pool sizes, that accounts for a mechanic that allows you to reroll up to X dice that are failures, but ONLY once per die. ...
3
votes
4
answers
1k
views
Handling many modifiers on a probability curve
So I've been working on a 2d20 based system for a side project, and it's playing out as a hybrid of a roleplaying system and a simulation-heavy combat game. This means that the engine has quickly ...
- 12.7k
8
votes
2
answers
793
views
How can I simplify a series of rolls without changing probability too heavily?
Ok, I'm working on a combat system converted from a video game to a tabletop game, and I'd appreciate some feedback on how I can make my combat defense system work. Currently attacking is handled as ...
- 12.7k