
IdleWorlds
RPGAn old-school text-based MMORPG in the browser where your character keeps progressing while you're offline.
Plays instantly in the browser
Play free — official siteVibeGameDB lists 5 games in this group, 4% of the 141 games on the Codex page. Each one has a source for how it was made. 4 are free or free to play and 1 is paid; 2 can be played in a browser. The most recently added is On The Edge | Civil Deputy Simulator (November 2026).
Ordered by editorial score, then player rating, then release date. Open a game for its sources.

An old-school text-based MMORPG in the browser where your character keeps progressing while you're offline.
Plays instantly in the browser
Play free — official site
A keyboard-only ASCII colony sim inside a dead god's corpse, coded mainly by Claude Code and Codex.
Download required
View on Steam
A political management sim with a twist, in which an ordinary person would inevitably make the wrong choices: answer events against the clock and watch your stats.
Plays instantly in the browser
Play free — itch.io
A free visual novel set in Lyr, a city where souls are sold as a product, about an inventor whose device makes people kind.
Download required
View on Steam
A Chinese text survival game set on a sealed university campus on the day of a zombie outbreak: you control only yourself, and the other students decide for themselves. Built by Codex from a published prompt.
Plays instantly in the browser
Play free — official site