Author: Matthew J. Neagley


About Matthew J. Neagley

First introduced to RPGs through the DnD Red Box Set in 1990, Matt fights on ongoing battle with GMing ADD, leaving his to-do list littered with the broken wrecks of half-formed campaigns, worlds, characters, settings, and home-brewed systems. Luckily, his wife is also a GM, providing him with time on both sides of the screen.

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I once watched a documentary on the early days of video games, and the particular part that has stuck with me was two brothers who started their own company right out of high school selling their games on floppies in plastic baggies through mail order fliers. They said (to my recollection): “We slept in shifts. I’d sleep while he programmed and when I woke up, we’d switch places. It was always a treat waking up and discovering what he had done, what new features he […]

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A while ago, I introduce the d10million, which is just a daily pill box full of d10s: This is fantastic for rolling multiple d10s simultaneously or for when you need a really big number, but by switching things up, you can do other things with your box o’dice. Ton O’Mooks: If you have a battle set up with a bunch of mooks, filling your dice box with the required dice to roll multiple attacks simultaneously can speed things up a lot.  Even if they have […]

The other day, Martin posed a question to me. To paraphrase: “How do I set up a die roll to determine how many encounters I have per day and when those encounters occur?” After some discussion, I suggested the below system, which is based on the Exponential distribution. Since we’ve gotten requests for info on this distribution before and the result turned out pretty neat, I wanted to share. The exponential distribution isn’t a concept that exists in a vacuum. Instead it’s a function of […]

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Outside of the comment stream, I had a surprising amount of people tell me they found my Overland Encounter Article useful (Three: which is three higher than usual). Universally however, the part of it they mentioned was the final paragraph and illustration: A brief note on die choice: With a single die, all outcomes are equally likely. The more dice you use, the greater central tendency of your roll, and the rarer the high and low values. Using dice of unequal size on the same […]

The Five Room Dungeon has been around almost as long as RPGs themselves, and has been enjoying a surge of popularity in the past few years as a quick and easy way to build a dungeon crawl.  Interestingly enough, it turns out there are only 9 base designs for the five room dungeon. With so few, it’s very easy to simply grab one of the nine, populate it and run a crawl, but it’s also easy to run the same basic layout multiple times until […]

Martin’s recent article on inking his new GameScience dice naturally led to a spirited discussion about GameScience’s claims that their dice are the best dice available in terms of randomness, which quite naturally leads one to ask: “Is my favorite die fair? How can I tell?” One possibility is to perform a chi*-square goodness of fit test. This doesn’t include any difficult math, though it can be tedious without a spreadsheet program. The purpose of a goodness of fit test (often called simply a chi-square […]

Like Most GMs, you probably find your self wondering from time to time just how competent your players are. Are they the well oiled, expertly min-maxed team they claim to be, or are they a bunch of bumbling monkeys? Luckily there’s a simple mathematically accurate method to test their claims based on simple linear algebra: Start with your dungeon map. Here’s a sample randomly generated dungeon from Donjon RPG tools: Once you have your map you’ll have to decide where the entrance is, which room […]