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Accretion

An idle game about growing a black hole, from a stellar mass cradled in a dying star to a cosmic singularity that warps the fabric of its own galaxy. Built in Flutter for iOS and Android.

Kind

Mobile game

Status

Beta

Stack

Flutter · Dart

Year

2026

01Overview

A game about scale, patience, and gravity.

Accretion starts small. You're a stellar-mass black hole in the debris of a collapsed star, pulling in loose matter one particle at a time. Every mass threshold unlocks a new regime of physics and a new scale: solar systems, nebulae, galactic cores.

The mechanics are idle, the feel is quiet. You make a few decisions an hour; the universe does the rest. We wanted a game you can keep in your pocket for a week, not a loop that demands you every ten minutes.

Under the hood it's a single Flutter codebase running a custom flow solver for gravitational capture, with a tuned balance layer that scales across ~20 orders of magnitude of mass.

Accretion key art — a black hole with the tagline 'Feed the singularity. Convert all matter. Reboot the universe.'
02Screens

A pixel HUD for a slow-burning universe.

Most of Accretion lives behind a single dense screen: mass, accretion energy, the era you're in, the percentage of the universe consumed. We pushed everything into a monospaced HUD so the numbers feel like telemetry, not UI chrome.

Boosts, mechanisms, and achievements sit one tap away. Everything is local-first, no account, no login.

Accretion main screen showing black hole mass, accretion energy, progression bar, and dark matter inventory.
Main HUD
Accretion boosts screen with daily quests and ad-supported boost cards.
Boosts & daily quests
Accretion cosmic objects and mechanisms screen with Meteorite, Comet, Photon Sphere, Electron Lens, and Quark-Gluon Plasma.
Cosmic objects & mechanisms
Accretion Disk Mastery capstone achievement, ready to claim a Void Crystal reward.
Capstone achievements
03Theming

Three fonts. Two themes. One HUD.

Players pick their own treatment. Light or dark, and a typeface that matches how they want to read the numbers: pixel Retro for the arcade feel, Orbitron for sci-fi, or Jakarta when they'd rather have a clean humanist sans.

Everything else stays the same. The layout, the telemetry, the tempo. Only the skin changes.

Accretion options screen showing Dark/Light toggle and three font choices: Jakarta, Orbitron, Retro.
Appearance controls
Accretion main HUD in dark mode with the pixel Retro font.
Dark · Retro
Accretion main HUD in dark mode with the Orbitron font.
Dark · Orbitron
Accretion main HUD in dark mode with the Jakarta font.
Dark · Jakarta
04What's next

Closing out beta. Shipping this year.

We're finishing the late-game regimes (supermassive, galactic core) and tuning the progression curve. Beta testing is ongoing. If you want in, reach out.

Planned: cosmetic variants for the accretion disk, Game Center / Play Games integration, and a quiet in-game log that remembers what you've swallowed.

05Talk to us

Interested in the beta?

We're taking a small group of testers through the late-game regimes. Drop us a line and we'll get you a build.

Request a build