In game, 'The Sum' refer simultaneously to the sums of all catastrophies, the name of a new currency and mispellings of the words 'son' and 'sun'.
The humans survived them and organised themselves according to a mix of anarchistic, aboriginal, technological and nomadic ways of living, embrasing anarchy ideas and goals (anti-domination, direct democracy, freedom and autonomy), creating federated communities. The world has been challenged by the Sum of all heavily anticipated catastrophies (environmental, human and tecnological). It can be called a positive post-apocalyptic game or a radical camping simulator. The game will be a bilingual (french & english) single player non-linear RPG. It takes place in eastern part of former Canada and United-States. This total transformation mod aims to bring to life an anarchist utopia after apocalyptic times. The Sum is a mod for Fallout Tactics: Brotherhood of Steel, created by Hugo Nadeau.