dHexUs currently supports Android on Google Play and iOS on Apple App Store (via TestFlight). To get access to the EA test versions, you must be manually added as a tester.
dHexUs currently supports Windows 10+ on Epic Games Store, pending release of v.0.6.0 which will be the first version available there. Please wishlist it in the meantime!
You can directly purchase an EA copy for dHexUs, or subscribe to support development, at the glhf Discord shop, or hang out and participate in the official dHexUs Discord (https://discord.gg/3zB7mg2hvp) for a chance to be added.
Look for the Big Codex of Rules and Such in the game client for details on how to play the actual game. Development is ongoing and the game is still evolving, so the rules are kept only in game to minimize having to update multiple sources.