HyperEVM Online - a browser-based MMORPG about a cat Hypurr and his adventures Made in one week. Open source. No install: three.js client with no build step, Node.js server that decides every hit, drop and coin. github.com/iwaterheater/hype… 2/ The numbers after 7 days: - 72 commits - 34,000 lines of JavaScript - 12,000 lines of tests, ~580 automated tests - 82 kinds of monsters - 7 classes, 30 skills, 44 items - one hand-sculpted island: 7 zones, 81 monster camps, 4,168 objects 3/ The process: every feature lived on its own git branch - HUD, PvP, icons, monsters, the map editor - developed in parallel and merged at the end of each day. After every change the game was run in a real browser and looked at, not just compiled. 4/ The cat is not a bought asset. It is modelled in Blender: the body, the weapons, the armour, the skill effects, even the loading screen art. Animation is code: rigid parts turned on pivots - run, jump, three sword swings, casting. 5/ The world is one data file, edited in a map editor that runs in the browser: sculpt terrain, paint ground, scatter trees with a brush, place monster camps, undo everything. The island was sculpted in that editor - no procedural generation at start-up. 6/ Monsters: 77 creatures by Quaternius plus KayKit skeletons by KayLousberg all CC0. Each zone has its own: slimes and deer in the meadows, orcs and raptors in the badlands, yetis on the peaks, demons on the cursed rim. Red name = attacks on sight. White name = leaves you alone. 7/ Classic MMO rules underneath: target-based combat, P.Atk vs P.Def, crits, evasion, stuns and sleeps, gear tiers, a blacksmith, a trader, professions at level 20. PvP follows Lineage II: flags, PK counts, karma. 8/ What went wrong along the way: - the first animals modelled for the game looked bad - replaced with CC0 packs - the disk filled up and took the server down - two branches edited the same files and broke the start-up once A test caught "peaceful" monsters still biting cats that walked past. 9/ What I learned: writing code is the fast part. The loop that matters is "run it, look at it, say what's wrong". Tests and a play-test in a browser after every change are what kept a week of parallel work mergeable. 10/ It's all in the repo: game, server, map editor, Blender build scripts, tests. Assets are CC0 (KayKit, Quaternius) or made for the game. Fork it, build your own island, add your own monsters. github.com/iwaterheater/hype… In the future, I’ll be adding a subdomain to PerpMe.fun where users will be able to jump into the beta and start playing. We’re also planning a clan system, sieges, raid bosses, and party-based gameplay. There will be a trading zone, token launches, a rewards system, and much more. We have so many exciting ideas, and we’d love for you to join us and help build one of the coolest blockchain games together! And most importantly - the first MMORPG game built on HyperEVM and Hyperliquid. We’re continuing to build something that nobody has ever built here before.