Abstract: A method for providing outcome variation for grid based number selection games is disclosed. The method allows novel interactions with random populations of numbers referenced on a grid which can be implemented as enhancements to existing grid based number selection games or as a standalone game, where the interaction involves placing one or more bets to predict the occurrences of combinations of a defined configuration that can be formed on a grid using a random number population. These bets can be implemented as side bets for an existing game in order to introduce new player strategies and reward options without disrupting the mechanics of the underlying game.