Varianta is a learning portal for the numbers under your game systems — how RNG actually behaves, how drop rates and loot tables get balanced, and what variance does to the way a run feels. We break each one down into formulas you can run in a spreadsheet.
No prior probability background assumed — we build intuition first, then hand you the formula and the spreadsheet that proves it.
What a pseudo-random generator really produces, why a fixed seed reproduces a run, and how a flat 0–1 value becomes a weighted pick. You'll build a small weighted picker and see where naive code quietly skews the result.
Turn a wish (“this should feel rare, but not cruel”) into weights. We compute expected tries to a first drop, model the long tail, and design a pity timer that guarantees a result by attempt n without breaking the economy.
Two systems can share the same average and feel completely different. We measure spread, model unlucky streaks, and connect variance to the emotional shape of a session — when players read a system as “fair” versus “rigged.”
Prove a design before it ships. You'll run thousands of simulated runs in a spreadsheet, read the histogram, and sanity-check the math against the sim so a balancing decision rests on evidence, not a hunch.
A designer sets a boss to drop an item at five percent. Playtesters swear it's broken — most never see it in twenty kills. The math says both sides are right.
At p = 0.05, the chance of seeing nothing in 20 kills is (1 − 0.05)²⁰ ≈ 0.36 — more than a third of players. The average is fine; the spread is what people actually experience. In this lesson we plot that spread, watch the variance band widen, then add a soft pity curve so the unlucky tail gets pulled back in without touching the headline rate.
You leave with the spreadsheet that drew this curve, so you can drop your own rate in and watch the shape change.
No new engine, no custom app to install. The whole course is built so you can follow along in a spreadsheet and a text editor, then reuse the files on your own game the same afternoon.
Pre-built workbooks for weighted tables, expected-tries curves and variance bands. Editable cells, no locked formulas — change a weight and watch every chart recompute.
A spreadsheet that runs ten thousand simulated sessions and plots the histogram, so you can compare your closed-form math against a brute-force result and catch the mistake before players do.
A downloadable reference: every formula from the course with a plain-language sidebar, plus printable worksheets to practice on. It's the thing you'll keep open in a second monitor while you balance.
Short, real prompts — “make this reward feel rare but reachable,” “tighten this streak” — with a worked solution to check yourself against once you've had a genuine go.
Varianta comes out of a small systems-design practice on the Vitória waterfront. The people behind it have spent years tuning economies and reward tables for live games — and watching designers and engineers talk past each other because one side speaks in feelings and the other in code.
This course is the bridge we wished existed: the intuition a designer needs, in the same language an engineer can implement, grounded in numbers both can check. Every example is one we've actually had to solve on a real build.
Each of these came in balancing systems by feel. They left plotting the spread — and reading their own drop tables like a chart.
I used to set a boss drop to “feels rare” and pray. Now I open the sheet, compute expected tries, and watch the unlucky tail before a single player ever sees it. The pity-timer lesson alone paid for the course — our worst outlier went from 60+ kills to a hard floor at 30.
Mateus Ferreira
Systems designer, mid-size studio
@mferreira.rolls
Break it down: our designers spoke in vibes, I spoke in code, and nobody could check the other. This course gave us one shared language — weights, variance, a histogram we both trust. First time a balance meeting ended in a number instead of a shrug.
Valentina Rojas
Gameplay engineer, live-ops team
@vrojas_dev
The Monte-Carlo sheet caught a bug in my loot table I'd have shipped. My closed-form math said one thing, ten thousand simulated runs said another — turns out I was double-counting a weight. Ran the sim, saw the histogram lean wrong, fixed it in an afternoon.
Diego Salazar
Indie developer & solo dev
@dsalazar.rng
What stuck with me was the variance module. Two reward tables, same average, one that felt fair and one that felt broken — and now I can point at exactly why. I model the spread first, then design the pacing around it. No more guessing at how a run will feel.
Camila Andrade
Reward & economy designer
@camila.variance
Lifetime access to the videos, spreadsheets and every update. Pay once — no subscription, no recurring charge.
Straight answers, read like a log. Query on the left, resolved value below.
ask[01] Do I need a maths background?
No. We assume you can add, multiply and open a spreadsheet — nothing more. Every idea is built from intuition first, and the notation is introduced slowly, always tied to a concrete game example. If a formula shows up, there's a plain-language version right beside it.
ask[02] Is this for designers or programmers?
Both, and that's the point. Designers get the intuition and the vocabulary to argue for a change with evidence; developers get the models and the spreadsheets to implement it correctly. The examples are chosen so a mixed team can finally reason about the same system in the same terms.
ask[03] What software do I need?
Any spreadsheet app — Google Sheets, Excel or LibreOffice all work. The workbooks are provided in an open format. Nothing else is required; you don't need a game engine or a coding environment to follow along.
ask[04] Is the ebook sold on its own?
For now the ebook comes with the Course + Ebook bundle rather than separately — it's designed to sit next to the lessons, referencing the same examples. If you already own the course, you can add the ebook later; just email us and we'll sort out the upgrade.
ask[05] Is this about anything to do with real-money games?
No. Varianta is strictly educational material about how video-game systems behave — drop tables, reward pacing and variance in the design sense. It is not about money changing hands on a result, and nothing here teaches or promotes that. See our disclaimer for the full note.
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