> For the complete documentation index, see [llms.txt](https://docs.catddle.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.catddle.com/technology/on-chain-randomness.md).

# On-chain Randomness

Catddle Game uses two mechanisms to ensure the on-chain randomness. One from Catddle Labs and the other from ChainLink VRF.

The default random generator is the Catddle Labs version, which will be much cheaper and faster. Users can also opt for ChainLink VRF.