Human hands have had 10 digits for millions of years. But it seems scientists at the University of Cambridge don't think this is quite sufficient. The experts have created the'Third Thumb' – a controllable prosthetic that attaches to edge of the right hand. It lets wearers pick up objects, open drinks bottles, sift through playing cards, peel a banana and even thread a needle – all with just one hand. In their study, human volunteers quickly got used to the extra digit – which could'advance our motor capabilities beyond current biological limitations'. The Third Thumb is worn on the opposite side of the palm to a person's real thumb and controlled by a pressure sensor placed under each big toe.

Large language models (LLMs) such as ChatGPT and GPT-4 have recently demonstrated their remarkable abilities of communicating with human users. In this technical report, we take an initiative to investigate their capacities of playing text games, in which a player has to understand the environment and respond to situations by having dialogues with the game world. Our experiments show that ChatGPT performs competitively compared to all the existing systems but still exhibits a low level of intelligence. Precisely, ChatGPT can not construct the world model by playing the game or even reading the game manual; it may fail to leverage the world knowledge that it already has; it cannot infer the goal of each step as the game progresses.