Huntercoin is an Open Source Crypto Currency similar to Bitcoin. It does NOT run on the XAYA platform however XAYA is based on the same technology and was developed by the same team.

The main difference with Bitcoin is that ~80% of the coins are obtainable by collecting coins in a virtual universe which resides inside the blockchain.

A Simple game is played to collect coins on a map of which has an element of Player vs Player combat to fight over resources. This can be termed as Human (or AI) mining, and the competition which has gotten more difficult over time can be called a Human (or AI) Difficulty level.

Huntercoin works similar to how a smart contract runs on Ethereum only much more complex and it was released before Ethereum was announced.