Example implementations relate to buffer-based update of state data. In example embodiments, a computing device may obtain current state data from a first buffer and determine next state data based at least on the current state data. The computing device may also obtain last difference data that corresponds, for example to current state data that is different from previous state data. The last difference data may be obtained, for example, using a difference data identifier. The computing device may store the last difference data in the second memory buffer. The computing device may also store in the second memory buffer new difference data corresponding to differences between the next state data and the current state data. The computing device may also update the difference data identifier based on the new difference data.