A user device supports a computer implemented game. An input from a user is received. This input requests a purchase of an in-game item. When this input is received, a determination is made as to whether the user device is on-line or not. If the user device is off-line, it is determined if the in-game item can be purchased in dependence on a locally available in-game currency budget. If so, the requested in-game item is provided in the computer implemented game.