The Powder Toy (TPT) is free, open-source software (GPLv3). There is no "Powder Toy 2" commercial version. The official, safe download is:
Website: powdertoy.co.uk
Download Page: Download.html (Windows, macOS, Linux, Android APK, Source code).
Android: Download the APK from the official site (not Play Store—Google removed it for policy reasons). Enable "Install Unknown Apps" for your browser. iOS: Not officially available due to App Store restrictions (no JIT, interpreter only). Use Web Powder Toy in browser or Alternate stores (AltStore) with community builds.
Verification: Check SHA256 hashes on the download page against your file.