Abstract: A system, a machine-readable storage medium storing instructions, and a computer-implemented method are described herein for a challenge engine. The challenge engine identifies a set of player metrics for players within a game and determines properties of at least one metric of the set of player metrics for a specified player. The challenge engine generates a first gaming instance based on the properties of the at least one metric. The first gaming instance is customized to the specified player. The challenge engine detects one or more interactions of the specified player with at least one element of the first gaming instance. In response to the one or more interactions, the challenge engine generates a second gaming instance based on the properties of the at least one metric. The second gaming instance is customized to the specified player and distinct from the first gaming instance.