A gaming system comprises a player interface (50) comprising a display on which a plurality of selectable symbol display positions are displayed to a player, the player interface (50) allowing a player to select one or more windows (700-703) defining respective ones of one or more subsets of the symbol display positions (600), and a game controller (60) arranged to select symbols for display at all symbol display positions (600), and to evaluate selected symbols within each selected window based on a win entitlement applying to the selected window to determine a game outcome.