A computing device is provided. The computing device includes a memory, at least one processor coupled to the memory and an action undo module executable by the processor. The action undo module is configured to receive user input requesting a target session of one or more sessions be undone. Each session of the one or more sessions includes at least one identifier of at least one tile that is affected by a respective action. The target session includes an identifier of a target action having affected one or more tiles identified in a collateral session of the one or more sessions. The collateral session includes an identifier of a collateral action. In one embodiment, the target session is lower in the first stack than the collateral session and the action undo module is configured to undo the collateral action and undo the target action.