# Gravity 80s — Swing-By Space Puzzle

> Swing-By Space Puzzle (iPhone/iPad app by kohta morishita.)

- Source: https://appshunter.io/ios/app/gravity-80s/id6760158837 (this page in markdown: same URL + `.md`)
- Developer: [kohta morishita](https://appshunter.io/developer/457218231)
- Category: Games, Action, Puzzle
- Price: Free (on sale, was $0.99)
- Age rating: 4+
- Requires: iOS 17.0 · 6 MB
- Languages: American English
- Released: 2026-03-11
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/gravity-80s/id6760158837/reviews.md

## What is Gravity 80s?

Gravity Dot is a space physics puzzle game where you pilot a tiny dot-ship through procedurally generated solar systems using only planetary gravity and a limited fuel thruster.

No waypoints. No autopilot. Just you, inertia, and gravity.

ARCADE MODE
Progress through increasingly complex solar systems. Use swing-by maneuvers to navigate around planets, avoid black holes, and reach the target star. Drain its energy to clear the mission, then spend earned energy on upgrades at the Hangar. 3 lives per run — one wrong orbit and it's game over.

ENDLESS MODE
Explore an infinite universe with no fuel limits. Absorb energy from any planet for score and drift as far as you can. Unlocked after clearing Mission 5.

HOW TO PLAY
- Drag anywhere to aim your thruster
- Hold to accelerate — fuel is limited, use it wisely
- Release to coast on inertia
- Use planetary gravity to slingshot, brake, and change direction
- Pinch to zoom in and out

FEATURES
- Real swing-by physics powered by a custom Velocity Verlet engine
- 300+ real celestial bodies from astronomical catalogs
- 17 procedural planet shaders — gas giants, ice worlds, lava planets, black holes, and more
- 4 distinct map layouts — solar system, corridor, cluster, and dual core
- 6-category upgrade system with 10 levels each
- Rogue planets and binary moons at higher levels
- Real-time orbit prediction line
- Planet scan HUD identifying nearby celestial bodies
- Full planet catalog tracking every encounter
- All sound effects and ambient music synthesized at runtime — zero audio files
- Retro pixel art visuals
- Game Center leaderboards

No ads. No in-app purchases. Just pure space physics.


## Version history (last 2 releases)

### 1.2 — 2026-03-14

Add 70's and 90's mode.
Also include minor bug fix.

### 1.0 — 2026-03-12

No release notes.

## More apps by kohta morishita

- [絵で見て覚える基礎英単語](https://appshunter.io/ios/app/id929770133)
- [四字熟語Free](https://appshunter.io/ios/app/free/id961349664)
- [ゆるたん＋](https://appshunter.io/ios/app/id1071468431)
- [信じるか信じないかはあなた次第、数学的に正しいあなたの今日の運勢](https://appshunter.io/ios/app/id1139225138)
- [8bit wizard](https://appshunter.io/ios/app/8bit-wizard/id1152022564)
- [ZZ Go](https://appshunter.io/ios/app/zz-go/id1205647373)

All apps by kohta morishita: https://appshunter.io/developer/457218231

## Related topics

[gravity 80s](https://appshunter.io/ios/topics/gravity-80s)

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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 2026-05-17.*