Shovel Knight: King of Cards - Get Out Of My Room! Feat (PS4)
There are multiple ways of getting into King Knight's Secret Room. These are the methods that I found.
Method 1 - Battery Brigandine Armor
Can be purchased from King Pridemoor on the Airship after you complete the Pridemoor Keep - Grand Hall stage.
Cost - 6500 Treasure
Method 2 - Scorching Saber
Can be purchased from Barton in the Volcanic Vault stage on the Troupple Kingdom map.
Cost - 9 Merit Medals
Method 3 - Bubble Frog
Can be purchased from the Troupple Acolyte in the Bubbling Bayou stage on the Troupple Kingdom map.
Cost - 7 Merit Medals
Method 4 - Gyro Boots
Can be purchased from TMK-500 in the Gyro Foundry stage on the Birder Kingdom map.
Cost - 10 Merit Medals
Method 5 - Scepter of Swiftness
Can be purchased from Skip in the Sprinter's Shoals stage on the Troupple Kingdom map.
Cost - 9 Merit Medals
Method 6 - Take a Dive (Not shown in video)
Location - Fancy House on the Birder Kingdom map.
Here you will find Mr. Hat's Fancy Shop. After you refuse to buy any of his wares, (you literally can't as each purchase is 100,000 treasure, and the cap is 99,999) he will stop you when you try to leave and force you into a boss fight. After you win, he relocates his shop to the Airship, and the "Fancy House" stage is replaced with the "Void Crater" stage. Re-enter the stage and return to where Mr. Hat's shop was. There you will find the NPC, Horzio. He will ask you a question, and if you answer: "I'm not afraid," he will grab you and take a dive off the cliff, which would normally kill you. If you activate the "Decree of Rejuvenation" before speaking to Horzio, when he takes you for a dive off the cliff, the Troupple you summoned will save you with a half heart of life and you will enter a short dream sequence. Upon finishing the dream, King Knight will wake up in his bed in his secret room.
*Thanks to commenter "Ioannis Chatzikyriakos" for pointing this one out!*
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*Shovel Knight: King of Cards was developed and published by "Yacht Club Games". I do not own any content pertaining to their Intellectual Property.*
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