Modern text adventure Subsurface Circular is available today for iPad.
In Subsurface Circular, you play as a robot detective who investigates the disappearance of other robots while aboard a futuristic underground subway system, with the entire game taking place on a single train carriage.
The title is already available in the US for $4.99 and will launch in the UK imminently, priced Ł4.99.
Back in August, Bithell told Eurogamer he is working on his next "big" game. However, he didn't give much away, saying: "I like jumping from genre to genre, from scale to scale. People should expect the unexpected, because, frankly, I can - and I enjoy that freedom."