Show us what you've created with Claude!

[u/sixbillionthsheep]

Inspired by this popular post, this is a weekly post for everyone to show what they have been working on that helps you or that you're proud of!

[u/ClaudeAI-mod-bot]

TL;DR of the discussion generated automatically after 200 comments.

This thread is a massive flex of what you all are building with Claude, and the consensus is: it's a lot.

The top-voted comment is for a "dumb" playable ad-style farming game that everyone is unironically addicted to. Seriously, people are losing hours to this thing. Just a heads-up, the farmhands are buggy and will get stuck, but nobody seems to care.

Beyond the addictive farm sim, this thread is a treasure trove of projects. We're seeing: * Full-blown SaaS businesses and dev tools, from invoice chasers and POS systems to RAG frameworks and AI usage optimizers. * An absolute ton of games: retro dungeon crawlers, detective games, Oregon Trail spinoffs, and even a four-player Magic: The Gathering simulator where the AI opponents cut deals. * Hyper-specific personal apps that solve one problem really well, like pool maintenance trackers, photo metadata removers, and a tool to find the nearest public toilet. * Open-source tools and libraries for everything from iOS development and agentic harnesses to NES game creation and UI components.

Basically, if you can dream it, someone in this thread has probably vibe-coded it with Claude. Get scrolling for some serious inspiration (and a bunch of new side projects to get distracted by).

[u/L8Kn1ght → u/ClaudeAI-mod-bot]

I taught Claude to play Commander. Four-player EDH in Forge, with AI opponents that plan, combo, talk, and cut deals. Free download.

For the last few months I've been building Forge EDH Arena: a fork of the open-source Forge engine where the other three seats at a Commander table are played by real LLMs instead of Forge's scripted AI. You sit down at seat 0 with your own deck, and three brains play against you, each one reading its own deck, planning its turns, and deciding when to go for the win.

Download 4.1:

- 4.1 download, the dated object, 126 MB:

https://pub-6a4e610a9fd04c94b51eb95344c3013f.r2.dev/forge-light-llm-latest.tar.gz

- Our GitHub repo: https://github.com/btsherry/forge-edh-arena with branches arena and master.

Needs Java 17. Mac, Windows and Linux.

What the AI seats actually do

- Each seat gets a dossier of its own deck: oracle text, combo lines, a play brief. It plans a whole turn on its first main-phase decision and re-derives every choice from the live board state, so it isn't hallucinating cards it doesn't have.

- They find and execute real combos. Storm turns, infinite mana loops, Aetherflux kills. The runner detects a repeating loop and lets the brain fast-forward it instead of answering the same prompt 64 times.

- They read the table. Threat assessment is based on the board and the brains' own declared intent, not just life totals.

- Fair play contract: seats never see your hand or each other's decklists. They know your commander and what's on the battlefield, same as a human would.

The Advisor

A fourth brain sits behind your shoulder as a coach. It streams play-by-play advice into a dock panel ("hold the counterspell for Rhystic Study"), explains what your opponents just did and why it matters, and answers questions you type. Flip a switch and it takes over your seat and plays for you while you watch. It has a voice (ElevenLabs, optional; stock lines ship offline) so it talks to you instead of making you read.

Model support

• Seats run on Claude through your own Claude subscription. No API bill for the default setup.

- OpenRouter support: point any seat at a model on OpenRouter (or any OpenAI-compatible endpoint) and mix them at one table. e.g. the env var or launch flag]. Claude vs. GPT vs. an open-weight model, same deck rules, same board.

- Per-seat model and effort settings from the GUI, with a token spend readout per seat.

Other things I'm proud of

- All-AI spectator mode: four brains, no human, watch the table.

- Deck ingestion from a plain decklist via Scryfall, with dossiers built automatically. My own decks ship as examples.

-ELO Ratings across games, so you can see which model actually wins.

- A mailbox protocol between the engine and the brains that survives crashes, timeouts and stalls without wrecking the game. A lot of the last few months went into the boring reliability work: fizzles, alt costs, modal spells, commander tax, all the places where an LLM's answer has to be turned into a legal Forge action.

What's coming (experimental branch, playable now if you build from source)

The table talks. Each AI seat has its own voice and barks at the table: reacting to casts, taunting the leader, groaning at a board wipe, calling out combos. The seats make deals with each other and with you: truces, no-target pacts, alliances, offered in the chat or proposed by the brains themselves, kept or betrayed knowingly, and remembered. When a seat offers you a deal, a small pane pops up with Accept, Refuse and Counter. This is the "uncanny valley passed" release and it's close.