Fallout 4's Survival Mode mode is available on Steam to anyone that wishes to participate in the beta. This new game mode will make almost every aspect of the game much harder and will have every decision you make affect a lot more than you'd think.
According the Bethesda, Survival Mode is founded on four concepts:
Strategy: Intensify decisions involving when to get into combat versus when to avoid it, and also make you think more about what gear to take into combat. Then back up those decisions with faster, more brutal fights.
Exploration: Slow down the pace of the game and encourage players to explore the nooks and crannies of the world.
Resource Management: Balance out items in the world that may be too easy to acquire or horde, giving players more to consider when planning their current loadout.
- Role Playing: Increase the realism of the world and the issues one might face there.
These concepts have made the game feature a particular set of rules. First off, there's no quick saving and almost all autosaves are disabled. The only way to save your game is to sleep for at least an hour on a bed that will offer you a better nights rest (yes, bed types matter in this mode). Fast travel has also been disabled, forcing you to explore more of the world.
Players will hit harded, but will also take more damage in the new mode making blocking and parrying a necessary part of gameplay.
There are plenty of other features coming in the mode, you can check them out on Bethesda's site.