Pulloseum (풀로세움)
No install, no build, no sign-up — it runs entirely in the browser and saves to local
storage. The whole game (code + data) is one index.html.
What it is
Pulloseum is a browser game where you explore alien planets, collect plant seeds,
raise them through six growth stages, and battle them in a Pokémon-style turn-based
tournament. It blends three genres:
- Idle / incremental — plants grow and bear fruit over real time.
- Turn-based tactical battle — a Clash-Royale-style loadout of skills, elemental
type matchups, status effects (poison / burn / bleed / buffs), and mutation cards.
- Collection & breeding — 170+ species and variants with procedurally drawn art,
rarity, traits, and a living in-game codex (Pokédex).
It ships as one index.html (~15,000 lines of vanilla HTML/CSS/JS, no framework),
plus a PWA service worker and a Capacitor Android wrapper for mobile.
Why I built it
I wanted to see how far a single-file, dependency-free, deterministic game could go —
a game that anyone can open by double-clicking one HTML file, that has no build step and
no runtime dependencies, yet still supports a deep battle engine, hundreds of creatures,
and offline play. It started as a personal project and is developed fully in the open.
Features
- Exploration — an orbital star map (11 planets / 4 orbits) with per-region species
distribution, ship upgrades, and fold-travel encounters.
- Growth & nurture — 6 growth stages, an idle fruit/harvest loop, and collectible pots
that modify growth speed and reward tiers.
- Battle — 1v1 tournaments (primary) and 3v3 team leagues with a shared energy pool,
6-skill loadouts, a separate mutation-card bar, deterministic combat resolution, and a
bot AI with archetype-driven behavior and telegraphed big moves.
- Species & skills — 170+ species/variants, 6 mutation forms (weapon / predator /
toxin / spore / dragon / normal), per-individual signature skills, and 20 traits.
- Mission / story mode — authored campaigns with deterministic boss gimmicks.
- Procedural plant art — creatures are drawn as composed SVGs (
composePlantSvg),
with drop-in PNG sprite overrides for hand-drawn art.
- Korean localization — automatic Korean particle (josa) handling for dynamic names.
- Offline-first — PWA + local-storage saves; installable, and packaged for Android
via Capacitor.
Run it
Easiest: double-click index.html — the whole game (code + data) is inlined, so it
runs with no server and no dependencies.
Local server (optional):
powershell -NoProfile -ExecutionPolicy Bypass -File .claude/serve.ps1 -Port 8765
# → http://localhost:8765
Android build: see docs/android-capacitor-wrapper.md.
There is no build step. Everything is plain HTML/CSS/JS.
Project structure
| Path | What it is |
|---|
index.html | The entire game — CSS, JS, and game data are all inlined. |
docs/master-roadmap.md | Single source of truth for status, direction, and design docs. |
docs/ | Design specs, battle/species guides, changelog, balance sheet. |
scripts/ | Node generators for species/skills/variant data (idempotent). |
tools/ | No-install, browser-based dev utilities (e.g. sprite prep). |
assets/, data/ | Sprites and reference data. |
android/ | Capacitor Android wrapper. |
Roadmap & maintenance
Active direction lives in docs/master-roadmap.md (the single
hub). Near-term goals include more species, a pixel-art UI pass, animation/sound, server-
authoritative PvP, and a Google Play release. Development happens in the open with a
documented per-change discipline (code and docs are committed together).
Tech
Vanilla HTML / CSS / JavaScript · PWA (service worker) · Capacitor (Android) ·
Node scripts for data generation. No framework, no bundler.
Author
Built and maintained by @promuzi.
License
See LICENSE.
