I have this idea…in fact I have too many of them…but I think this idea is a good one!
The idea revolves around primary colours and secondary colours (and maybe tertiary colours and complimentary colours. Imagine a card game where you create six piles. These piles form a pyramid with primary colours at the apexes and secondary colours on the sides (see picture below). Red cards are played on the red pile, blue on blue and yellow on yellow. These have a positive effect on the colour they are played on. The secondary cards are placed on their matching colour but affect the two primary colours that they neighbour – the effect can be either positive or negative depending on the action on the card. If you place a primary card sideways then it will affect the two secondary colours that it neighbours. The goal is to ‘promote’ one of the primary colours – the most ‘powerful’ primary colour wins. Potentially each player would have a ‘secret’ mission to support one of the primary colours.