frontpage.
newsnewestaskshowjobs

Made with ♥ by @iamnishanth

Open Source @Github

Open in hackernews

Show HN: Mochia, a virtual pet browser game, built with Rust, SolidJS, Postgres

https://mochia.net/
15•lemphi•14h ago
Around three years ago, I was reminiscing about how much I loved playing Neopets as a kid. Meanwhile, I was also looking for a project to better learn Rust and SolidJS. So.. I figured making my own virtual pet browser game would be a fun way to practice! Since then, I’ve been working on it nearly every day, and.. it’s grown quite a bit! Here are some bulleted lists for your convenience:

Technical Details:

  * Backend monolithic Rust server runs on a single $5/month VPS

  * Lean frontend with just 3 dependencies (SolidJS, Solid Router, and Mutative)

  * Around 130,000 combined lines of code (frontend + backend)

  * Rust server uses axum, sqlx, tokio, rand, strum, tungstenite (websockets)

  * No server crashes or data loss in 3 years (thank you Rust + Postgres!)

  * Almost all graphics (500+ assets) are SVGs for perfect detail at every zoom level

  * Fully mobile responsive and playable on all modern browsers and devices

  * Actor model for player actions enables trivial parallel, multi-core scaling

  * Single page application that preloads entire game world on initial page load

  * Instantaneous navigation between pages (no additional page fetches required)

  * Lightweight game engine for minigames, powered by custom WebGL shaders

  * Rust is the single source of truth for data structures shared between browser and server

  * Custom derive macros used to autogenerate TypeScript bindings and binary decoding functions

  * Binary WebSocket messages with custom protocol for client-server communication

  * O(1) selection for nested, weighted-random item reward pools

  * Minigames can be played without an account (but rewards can't be saved)

Features:

  * Completely free to play with no ads or tracking

  * Multiplayer browser-based virtual world with 80+ locations to explore

  * Dark mode toggle switch

  * Simple minigames that smoothly run at your display's refresh rate

  * Public leaderboards that track the top scores in each minigame

  * Pet training system with turn-based card-based battle arena

  * Dynamic player economy with player-run shops

  * Player guilds that members can level up to unlock perks

  * Abandoned mines area created by maze generation algorithm

  * Create / adopt pets, adorn them with hats, give them pets, change their color, etc.

  * 220 items to collect (food, toys, cosmetics, books, charms, tiny creatures, etc.)

  * In-game currency with banking, auctions, stock market, and jobs system

  * Villagers you can talk to, befriend, and complete quests and jobs for

  * Optional push notifications (like for when you win an auction)

  * 38 achievement avatars to unlock

  * Social features: befriend others, send gifts, and share your recent activity

  * NPC shops that restock over time (sometimes with very rare items!)

  * Luck system with ways to boost your luck for better rewards

  * Many puzzles that grant items or MP (currency) when solved

  * Fishing, gardening, caves, random events, fountains, galleries, etc.

  * Wheels to spin, treasure maps to complete, and secrets to explore!

  * Much, much more but I don't want to spoil everything!

Links:

  * Website URL: https://mochia.net

  * Community Discord: https://discord.gg/ub6z8YH866

  * Gameplay Video: https://www.youtube.com/watch?v=CC6beIxLq8Q

  * Screenshots Album: https://imgur.com/a/FC9f9u3

I'd love to answer any questions, hear any thoughts, or read any sort of feedback or criticism!

Comments

npinsker•9h ago
I played Neopets a long time ago. It meant a lot of different things to a lot of people, and -- while you're obviously not 100% there yet -- it's incredibly impressive to have done such a large piece of it on your own.

That said, I always saw the "core fantasy" of the experience as developing a relationship with your pet(s). I liked having to feed my pet, and read books to it, and then it would talk to me back. Playing games and going on adventures were framed as being done "with" your pet. The pets were well-drawn and cute, and the higher-level cosmetic items were expensive but very desirable.

From your page, I wasn't sold on that fantasy, or any fantasy in particular. If you look at the popular pet-care games nowadays, they have a fraction of the features you do while still (clearly) striking a chord with a huge number of people. Maybe part of it is because they focus on that relationship more? Especially in today's world -- but even back in 2000 -- I think features like games, items, stats, etc. need to tie in to some sort of greater fantasy in order to catch interest.

You don't have to care about any of this though, especially since you're making it for yourself. It looks fun and the tech stack seems awesome.

Is it actually possible to play minigames without creating an account? I couldn't figure out how.

lemphi•8h ago
Thank for you for this thoughtful reply!

Yeah, I definitely hear you with regard to the "greater fantasy" aspect. Some other players have also recently mentioned their desire for more fleshed out lore. It's something I personally struggle with but I should definitely do better in this regard, as I do want mochia to be enjoyed by more people.

You currently can feed your pets, give them toys, and read books to them (each book also has unique text that you can read inside, often with secrets about the world), and your pets should reply with their reaction (as different pet species like different things), but I agree with you that a lot of these interactions don't really "sell" themselves, and they certainly deserve more polish.

And yes, the minigames don't require an account. My apologies, I should have been more clear in the original post on exactly what a minigame is in this context. These are the locations that start off with a black tutorial screen, and then generally involve a game loop. Most other locations require an account because they require making a request to the server, but minigames can just be played entirely client-side just for fun. Here's some of my favorite ones that don't require a login:

https://mochia.net/map/airia/shrumble

https://mochia.net/map/whisperwood/enspell

https://mochia.net/map/treehollow/snarf

https://mochia.net/map/treehollow/loose-lambs

https://mochia.net/map/airia/leapscape

https://mochia.net/map/whisperwood/stellara

https://mochia.net/map/airia/sugar-rush

https://mochia.net/map/dunespire/pyramid/brick-break

https://mochia.net/map/ghoulery/spelunker

https://mochia.net/map/whisperwood/comet-rush

https://mochia.net/map/whisperwood/fruit-blast

https://mochia.net/map/whisperwood/radiant-revival

https://mochia.net/map/flakefall/matchicle

kwere•7h ago
how much game data do you store on postgres ? do you use classical update cycles ?
lemphi•6h ago
Basically the bare minimum amount of data is stored in Postgres. Many of the locations are stateless, or it's okay if they are wiped on server restart (like NPC shop inventories, since they can just be regenerated on server startup, so they only exist in server memory). And most of the game world is just included in the large static bundle (item names and descriptions, dialogue, etc.).

The main data stored in Postgres are things that must be durable, like your items, currency, unlocked avatars, friends list, gallery, garden, guilds, friendship levels with villagers, profile information, personal shops, and things like that. But even in these cases integer identifiers are used (for things like item IDs and avatar IDs), so the tables remain very lean.

What do you mean by classical update style? I'm not sure if you're still referring to Postgres or if you're talking about the minigames (like does the update loop run at a fixed internal?), or maybe something else entirely?

Show HN: Dhansishtha-2.0-preview – First Intermediate Reasoning model

https://helpingai.co
3•VarunGuptaHAI•1h ago•0 comments

Show HN: I built sinkedin – a LinkedIn but for flauting failures and screwups

https://www.sinkedin.app/
6•preetsojitra•2h ago•0 comments

Show HN: I rewrote my notepad calculator as a local-first app with CRDT syncing

https://numpad.io
34•tonyonodi•3d ago•11 comments

Show HN: HomeBrew HN – Generate personal context for content ranking

https://www.hackernews.coffee/
110•azath92•19h ago•43 comments

Show HN: Mochia, a virtual pet browser game, built with Rust, SolidJS, Postgres

https://mochia.net/
15•lemphi•14h ago•4 comments

Show HN: CSS generator for a high-def glass effect

https://glass3d.dev/
409•kris-kay•1d ago•107 comments

Show HN: Recivo – Receive Emails Programmatically

https://recivo.email/
23•WilcoKruijer•21h ago•0 comments

Show HN: A stupid simple barely S3 compatible file server

https://github.com/antholeole/s3plz-rs
3•AnthOlei•7h ago•1 comments

Show HN: Built email parsing for booking confirmations for my travel app – Aruko

https://www.aruko.world/
5•ankit21j•7h ago•0 comments

Show HN: Jobs by Referral: Find jobs in your LinkedIn network

https://jobsbyreferral.com/
171•nicksergeant•2d ago•63 comments

Show HN: A continuation of IRS Direct File that can be self-hosted

https://github.com/openfiletax/openfile
241•elijahwright_•3d ago•32 comments

Show HN: Claude Code History Viewer for macOS

https://github.com/jhlee0409/claude-code-history-viewer/releases
4•jackleee•10h ago•4 comments

Show HN: I made a 2D game engine in Dart

https://bullseye2d.org/
96•joemanaco•5d ago•39 comments

Show HN: I built the tool I wished existed for moving Stripe between countries

https://www.stripemove.com/
102•felphos•2d ago•53 comments

Show HN: Spegel, a Terminal Browser That Uses LLMs to Rewrite Webpages

https://simedw.com/2025/06/23/introducing-spegel/
421•simedw•2d ago•180 comments

Show HN: Opasm, an Assembly REPL

https://github.com/aedrax/opasm
24•aedrax•1d ago•0 comments

Show HN: SteadyText: Deterministic LLMs: Same input → same output, every time

https://steadytext.julep.ai
4•diwank•12h ago•0 comments

Show HN: Core – open source memory graph for LLMs – shareable, user owned

https://github.com/RedPlanetHQ/core
109•Manik_agg•2d ago•37 comments

Show HN: A browser extension to control Google's Random Number Generator

https://github.com/weefunker/Google-Random-Number-Generator-Override
3•chompin•13h ago•0 comments

Show HN: Peer. – The First Subscription-Based Social Network

https://www.peerfreund.com/
4•AmuXhantini•19h ago•4 comments

Show HN: HackerNewt – Breadth-first exploring HN client for iOS

https://apps.apple.com/us/app/hackernewt-for-hacker-news/id6448201970
67•hnand•2d ago•30 comments

Show HN: A modern C++20 AI SDK (GPT‑4o, Claude 3.5, tool‑calling)

54•cauchyk•4d ago•6 comments

Show HN: KLogger – Quick CLI to grab all deployment logs from a K8s namespace

https://www.github.com/christensen/klogger
2•christensen143•15h ago•0 comments

Show HN: RingtoneSmartKit – Kotlin Library for Android Ringtones

https://github.com/AmjdAlhashede/RingtoneSmartKit
2•AmjdAlhashede•16h ago•0 comments

Show HN: Open-Source International Space Station Tracker ESP32/Arduino for $20

https://github.com/GuitarML/SpaceStationTracker
72•keyth72•6d ago•18 comments

Show HN: I'm an airline pilot – I built interactive graphs/globes of my flights

https://jameshard.ing/pilot
1529•jamesharding•6d ago•197 comments

Show HN: TokenDagger – A tokenizer faster than OpenAI's Tiktoken

https://github.com/M4THYOU/TokenDagger
279•matthewolfe•3d ago•72 comments

Show HN: Arch-Router – 1.5B model for LLM routing by preferences, not benchmarks

66•adilhafeez•2d ago•15 comments

Show HN: Puteron, Systemd Competitor

https://github.com/andrewbaxter/puteron
6•rendaw•1d ago•0 comments

Show HN: New Ensō – first public beta

https://untested.sonnet.io/notes/new-enso-first-public-beta/
249•rpastuszak•3d ago•87 comments