
The Hollow Knight: Silksong adventure introduces players to various intriguing items, one of which stands out for its hefty price tag: the Simple Key. At the Bone Bottom merchant’s shop, you might be taken aback by its cost of 500 rosaries. It’s natural to feel that spending such an amount for a mere key is unjustifiable.
Yet, these keys unlock some of the most exciting and beneficial content within the game. Although their price might deter you initially, investing in them will be advantageous in the long run. This guide will provide you with comprehensive details on the locations of each Simple Key and the corresponding doors they open.
Simple Key #1
Bone Bottom

The first Simple Key is located in the Merchant’s shop at Bone Bottom. While this key costs 500 rosaries, which can feel steep when you’re just starting out, it may be wise to return for it later in your quest when you have a bit more currency.
Simple Key #2
Songclave

In Songclave, the second Simple Key is also available for purchase from a merchant. However, she won’t be there upon your first arrival. To access her services, you must complete the Wandering Merchant quest, which can be initiated via the Wishboard.
Once you assist Jubilana, she will sell you the key for 650 rosaries. Fortunately, her location is conveniently near the elongated Citadel corridor, which offers opportunities for farming additional resources!
Simple Key #3
Sinner’s Road

The third Simple Key awaits you in the Sinner’s Road area, obtainable as a reward for defeating a formidable enemy brandishing a chain. To prepare for this encounter, you will require the Cling Grip, which can be acquired from Shellwood.
Proceed through a perilous spike-filled shaft, and you will reach a small arena where the enemy will drop down. Defeating him will reward you with the coveted key.
Simple Key #4
Sands of Karak
Your final Simple Key can be found in the challenging Sands of Karak area. Accessing this key requires obtaining the Clawline ability, available in Act 2. Though the area presents formidable challenges, locating the key doesn’t require extensive exploration.
Navigate through the intricate vine puzzles from the left to the right side of the area, and at the far eastern boundary, you will discover a bench. Rest up and secure your key while you’re at it!
Door Location #1
Wormways

The initial door you will likely encounter is positioned beneath the Wormways entrance, just above Bone Bottom. To unlock it, head west from Mosshome, making your way across a gap and through a cave occupied by a large acid spitter.
This door opens access to a broader section of the Wormways, enabling you to collect the Sharpdart and the Plasmium Phials.
Door Location #2
Sinner’s Road

While navigating through Sinner’s Road, you may come across the Green Prince sitting in his cell. He may not explicitly urge you to unlock the cell, but it is a worthwhile endeavor.
In Act 3, further along the road, he will assist you in accessing the Verdania area—a beautiful hidden locale featuring a memorable boss encounter.Securing rewards from this area can be especially beneficial for players struggling in the late stages of the game.
Door Location #3
Deep Docks

Venture into the Deep Docks, and you will encounter another lock tied to the Simple Keys. However, be forewarned—this region isn’t intended for early-game exploration. Without the right gear and strategy, you might find yourself overwhelmed by the nearby enemies.
Despite its risks, the Deep Docks house valuable tools, including Flintslate. Although this area is crucial for progression in Act 3, it can also be accessed via the Far Fields once you acquire the Clawline, rendering this key door somewhat unnecessary.
Door Location #4
High Halls

Inside the High Halls room, players can find a treasure trove of rosaries, along with the coveted Rosary Cannon tool, enhancing gameplay and combat effectiveness.
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