If you are looking for ways to play without a direct purchase, there are legitimate subscription options:
: You can play Manifold Garden for "free" (included in the subscription) on iPhone, iPad, Mac, and Apple TV if you have an active Apple Arcade subscription. Manifold Garden Free Download (v1.1.0.17370)
Once you have the game, here is a basic overview of how to navigate its "Escher-esque" world: How long is Manifold Garden? - HowLongToBeat.com If you are looking for ways to play