A computer implemented method of managing objects presented on a user interface of a computer device having at least one processor and at least one memory, comprising displaying an arrangement of selectable objects each having one or more characteristics, information on said arrangement of objects and said objects being stored in said at least one memory, determining a selection of at least a first object in dependence on a user input received via the user interface, evaluating using the stored information on said arrangement, if the selected shares one or more characteristic with neighboring objects in the arrangement, determining an input time period of the user input; determining, in dependence on the stored information on said board arrangement if the selected object shares one or more characteristics with neighboring objects; and if so indicating a valid status to a user by highlighting or removing at least the selected object.