DoomDay

The key concept of the game "Doomday” revolves around the smart disposal of trash-cards, trying to reduce the staggeringly big pile of trash, all while keeping the tower of doom as small as possible. The difficulty of this undertaking becomes apparent as the game continues, as the simple act of disposing of a card turns from a mindless act to a nerve-wracking action, the larger the tower of doom grows.  

Considered from a meta-perspective, an approach only focusing on personal gain leads to the downfall of all, as sabotaging playstyles come back to trouble oneself as well. Designed as a card game where players oppose each other, they will ultimately realise they can only fully recycle the big pile of trash if they work together, or else the tower of doom will fall, and everybody will have to live with the consequences that this brings.