# 1st Principle: Calculus Game — Graphing Calculator Platformer

> Graphing Calculator Platformer (iPhone/iPad app by Wonmo Seong.)

- Source: https://appshunter.io/ios/app/1st-principle-calculus-game/id6760980245 (this page in markdown: same URL + `.md`)
- Developer: [Wonmo Seong](https://appshunter.io/developer/1625011193)
- Category: Games, Education, Action, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 125 MB
- Languages: American English
- Released: 2026-03-24
- Data updated: 2026-10-31

## What is 1st Principle?

1st Principle is a calculus platformer built on a live graph. You run and jump along y = f(x), and the derivative decides where you can stand: where the slope gets too steep, the path breaks into gaps and hazards. Every level turns an idea from math into something you can see and play.

PLAY THE MATH
– Platforms follow the curve and f′(x) shapes the gaps and hazards, so a function and its derivative stay connected in your head
– 59 levels: parabolas, sine and cosine, Maclaurin and Taylor series, multivariable slices, area under the curve and Riemann sums, damped oscillation, polar roses, logistic growth, Fourier and Laplace transforms, Big O growth rates, aerospace and physics stories, and boss levels such as the Mandelbrot set and the Lorenz attractor
– Earn up to three stars per level, beat your best score and unlock achievements
– A daily challenge with goals and a streak to keep
– Hints that explain the rule behind each level

GRAPHING CALCULATOR MODE
Switch to a free graph workspace from the menu: type an expression, adjust it, then zoom and pan (pinch on touch screens) to explore functions without the platformer.

LEARN AS YOU PLAY
An in-game reader covers differentiation rules, definite and indefinite integrals and topic glossaries, with short study notes for AP Calculus BC, AP Physics C, AMC 10/12, TMUA and MAT. The exam notes are unofficial study companions and are not affiliated with College Board, MAA, the University of Oxford or any test board.

WHO IT'S FOR
High school and university students in precalculus and calculus, anyone preparing for AP Calculus or AP Physics C, and anyone who learns better when an equation has a shape.

FREE, FULL GAME AND PLUS
The first 14 levels, the daily challenge and 3 hints a day are free. Unlock every level for good with the one-time Full Game purchase, or subscribe to First Principles Plus for every level, unlimited hints and a streak shield that forgives one missed day a week. Plus is a monthly or yearly auto-renewing subscription. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel them in your Apple Account settings.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://github.com/rkaissi/First-Principles/blob/main/privacy-policy.md

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Plus, billed yearly | $9.99 | per year |
| Plus, billed monthly | $1.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock All Levels | $4.99 | one-time |


## Is 1st Principle safe?

Not enough ratings yet to assess 1st Principle.

## Is 1st Principle legit?

1st Principle: Calculus Game appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for 1st Principle is 70 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.4.1 — 2026-10-28

Fixes the derivative graph: f′ now sits on its own axis across the plane, so the red curve is always visible and matches the ground you land on. Every level was checked with the real jump physics, so spawns, checkpoints, tokens and exits are all reachable. The graphing calculator gains Trans and Scale buttons.

### 1.4 — 2026-10-27

A clean new look across every screen and the graphing calculator.
New world map: themed regions, a path that fills as you clear levels, stars and medals on every tile.
Optional challenges: Flawless runs, Time trials, region trials and a Grand trial.
Tighter controls (coyote time, jump buffering, hold for higher jumps), ∂ tokens, springs, checkpoints and instant restart.
Daily challenge, hints, achievements and a short walkthrough for new players.
First Principles Plus: unlimited hints and a streak shield. Full Game owners keep every level.

### 1.1 — 2026-04-13

Fixed bugs and issues that the obstacle course is too far from each other, making it nearly impossible to jump in-between.

### 1.0 — 2026-03-24

No release notes.

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All apps by Wonmo Seong: https://appshunter.io/developer/1625011193

## Related topics

[riemann](https://appshunter.io/ios/topics/riemann) · [1st principles](https://appshunter.io/ios/topics/1st-principles) · [first principles](https://appshunter.io/ios/topics/first-principles)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-31.*