Download size

How many GB is Mastermind?

2 GB

That is less than the typical Indie game, which needs about 3 GB.

Leave at least 8 GB free: games need headroom to unpack updates.

The figure is the storage Steam lists as required for this game, not a measured download.

As the survivors in the game show. You will have to prepare yourself with every opportunity possible to arm and supply yourself with weapons and gear. Fight your way through the show with or without Preparation which you will have to make do with what you have.