If you're looking for a gameplay guide rather than the game itself, several high-quality resources are available for free:
: You can play 8-Bit Bayonetta for free on Steam as a fun, retro-style promotional game.
: The official digital manual for the Wii U version is available directly from Nintendo, covering basic controls and mechanics.
: You can find a community-uploaded version of the Bayonetta 2 Official Prima Guide on the Internet Archive for free streaming or borrowing.
There are two primary legitimate ways to play, with one "free" mini-game alternative:
