An Investigation into the Open World Survival Game Crafter

We share our experience with the recently released Crafter benchmark, a 2D open world survival game. Crafter allows tractable investigation of novel agents and their generalization, exploration and long-term reasoning capabilities. We evaluate agents on the original Crafter environment, as well as on a newly introduced set of generalization environments, suitable for evaluating agents' robustness to unseen objects and fast-adaptation (meta-learning) capabilities. Through several experiments we provide a couple of critical insights that are of general interest for future work on Crafter. We find that: (1) Simple agents with tuned hyper-parameters outperform all previous agents. (2) Feedforward agents can unlock almost all achievements by relying on the inventory display. (3) Recurrent agents improve on feedforward ones, also without the inventory information. (4) All agents (including interpretable object-centric ones) fail to generalize to OOD objects. We will open-source our code.