Timewarp

Players mark a region with the Timewarp Axe, then run a command to create a named area from the selected corners. Each area can be given a custom name, such as an alpha-era label, and its rules follow the older gameplay chosen for it. Holding the axe shows the areas within render distance, so their boundaries can be seen before entering.

Areas can hold random challenges that pull in old-school mechanics, and most behavior is adjustable. Settings control how time shifts work, which mechanics apply, and whether sprinting is allowed as in early versions. All area data is stored in the world's root folder in a timewarp data file, so the setup is specific to each world. Server owners and players can edit the configuration directly through commands or by changing that file.

The mod runs on Fabric and requires Fabric API. It is compatible with NeoForge through Sinytra Connector, which in turn needs Forgified Fabric API. Timewarp runs in a client and server environment, so the server and every player need the mod. It is released under the GNU General Public License v3.0 only and is open source. Files are published for 1.21 and 1.21.1, and the latest Fabric build is 1.1.7 for 1.21.1.