The official mobile ports by Mob Games Studio are available on the Google Play Store and Apple App Store. These are generally paid apps. Unofficial or "Free" Versions

You may see "Free" listings on third-party sites, but these come with significant risks:

Some older development builds or prototypes have been archived on sites like the Internet Archive , but these are often incomplete or unstable. Game Details to Know Poppy Playtime Chapter 2 Dev Build - Internet Archive