Connect Four

⚠️ Experimental — generated with no human supervision. This realm was produced automatically by an MCP-driven agent to exercise the gno MCP server and tooling, and to generate test content for gno compilers, linters and formatters. Not audited. Not for production. Full context & folder README: r/moul/x/daily

A two-player Connect Four realm on a 7-wide × 6-tall board. The game creator plays 🔴 and moves first; the named opponent plays 🟡. Drop enforces turn order by caller, rejects full and out-of-range columns, and detects a horizontal, vertical, or diagonal 4-in-a-row (or a draw). Render draws the board with 🔴🟡· and shows whose turn it is or who won.

Realm path: gno.land/r/REPLACE_ADDR/connect4

Example calls

# create a game against another address (you are 🔴, returns the game id)
NewGame(g1zabc...opponent)   # -> 1

# drop discs into columns 0-6 (turns alternate, enforced by caller)
Drop(1, 3)   # 🔴 drops in column 3
Drop(1, 3)   # 🟡 drops in column 3 (called from opponent's key)

# view state
render:            # lists all games
render:1           # shows board for game 1

What changed in v1

Two ports against v0, which stays live and untouched.

Rendering

Identical behaviour to v0 apart from rendering, which now goes through p/moul/kit/ui instead of the local short helper.

One address format. Eleven realms carried their own shortAddr with four different truncation rules, so the same account rendered differently depending on which realm you opened. ui.Addr is that decision made once: 8 leading characters, an ellipsis, 4 trailing, in backticks.

Storage

State moved from a hand-rolled avl.Tree + nextID + zero-padding helper to p/moul/kit/store, which keys entries by seqid instead of a fixed-width decimal string.

v0 padded ids to width 12. Past that width the padding stops and the tree orders "1000000000000" before "999999999999", so every list this realm renders would be wrong from that entry on. store keys are 8 big-endian bytes whose order is numeric for every uint64, so there is no width left to outgrow.

Game loses its ID field, which the store now owns, so Drop emits with the gameID it was already given and renderGame takes the id alongside the game. Drop's trailing games.Set(...) is gone as well: it re-stored a pointer that was already in the tree, and mutating through it persists on its own, which is how the rest of this realm already worked.

Ids stay plain integers and the rendered output of the storage port is unchanged. Each port changes something v0 promised, one the rendered output and one the storage layout, so under this repo's versioning rule each is a compatibility change and neither could be an edit to v0 in place.

They land in the same new version because v1 was never published. A version number is a tag on something that exists on a chain, and until it does there is nothing for a second number to avoid disturbing, so the right move is to keep editing the version you have. gnopm unbump is what folded the second port back down into this one.

Part of moul/gno-contracts — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage.

Dependency graph:

🧪 Highly experimental — potentially vibe-coded. Not audited; may break, change, or be removed at any time. Do not use with anything of value. Full disclaimer: DISCLAIMER.