Grounded is due to his 1.0 on September 27th. Or you could wait for it to leave testing. This is what you have to expect from grounded: No Health or Ammo indicators.

There are some major changes that will make the run very hard, especially if you pair this with Permadeath or decide to not use any of the Accessibility options. Note that, even within the context of Grounded's early access, Shared Worlds are considered in beta and 'could require online shared saves to be reset / lost as bugs are ironed out.' If you're going to use it at this stage, backup your saves. Grounded is the hardest setting for The Last Of Us II. You can also download Shared Worlds and convert them into Standard Worlds, if you want to continue playing them solo. You can be the owner of three Shared Worlds and have 50 Shared Worlds shared with you at any given time.

The public test patch notes say that previously created Standard Worlds can be converted into Shared Worlds. (Actual dedicated servers are seemingly still being considered.) It's a little of the functionality of a dedicated server, then, but with player-hosted servers. Any progress made in that world is then synched, so that the next person who hosts it - whether a different player or the original owner again - can carry on from its most developed state. With a Shared World, one of the other players can now re-host the world while the original owner is offline, so folks can continue playing.

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