Grounded Mode in The Last of Us is an extra hard difficulty mode for the game that was recently released for the game.

According to Naughty Dog, Grounded Mode will be the hardest challenge you’ll ever face as you try to complete the single-player campaign of The Last of Us. The AI is relentless, smart, and brutal, and survival will be near impossible. “Completed Grounded Mode” might be one of the most difficult Trophies you’ll ever earn.

To that end, you'll need to use your shivs to access certain locked areas to get yourself better equipped for the challenges ahead.

Here's what you'll find behind shiv doors in the Grounded Mode:

1) The Outskirts, Downtown: 25 parts, 10 pills, 1 bottle.

2) The Outskirts, Museum: 25 parts, 10 pills, 0.5 rag, 2 revolver bullets, 2 pistol bullets.

3) Bill's Town, The Woods, door #1: 10 parts, 15 pills, 2 rifle bullets.

4) Bill's Town, The Woods, door #2: 25 parts, 15 pills, 0.5 alcohol.

5) Pittsburgh, Alone and Forsaken, door #1: 50 parts, 5 pills, 0.25 scissors, 0.5 explosives, **pipe** (melee weapon), *Lost Areas Map (artifact)*.

6) Pittsburgh, Alone and Forsaken, door #2: 50 parts, 15 pills, 0.5 rag, 2 rifle bullets, 1 arrow, 1 bottle, *Mother's Letter (artifact)*.

7) Pittsburgh, Financial District: 50 parts, 10 pills, 0.5 rag, 0.25 scissors, 2 pistol bullets.

8) Pittsburgh, Escape the City: 25 parts, 15 pills, 0.25 explosives, 1 rifle bullet, 2 pistol bullets, *comic book*.

9) Tommy's Dam, Hydroelectric Dam: 50 parts, 10 pills, 0.5 alcohol, 0.5 explosives, 1 arrow.

10) The University, Science Building: 50 parts, 15 pills, 0.5 rag, 10 flamethrower fuel, **Training Manual (Molotov)**, **Tools lvl. 4**.

11) Lakeside Resort, Cabin Resort: 50 parts, 10 pills, **Training Manual (Smoke Bomb)**.

12) Bus Depot, Underground Tunnel: 50 parts, 10 pills, 0.5 sugar, 1 arrow.

13) The Firefly Lab, The Hospital: 10 pills, 0.5 rag, 0.25 explosives, 2 revolver bullets, *Firefly Pendant (artifact)*.