how to buy the mysterykey in deltarune ch5
To buy the Mystery Key in DELTARUNE Chapter 5, collect 10 Pink Coins, then go to the shop in the Cliffs and purchase it there. After that, use the key on the pink door later in the chapter to reach the secret-boss path.
What to do
- Find 10 Pink Coins around the Dark World.
- Travel to the Cliffs shop.
- Buy the Mystery Key with those coins.
- Use it on the pink door near the castle area.
Extra detail
Some guides say there are more Pink Coins scattered around than you actually need, but 10 is the amount required for the key. The key is specifically tied to unlocking the secret-boss route, not a normal story item.
TL;DR: get 10 Pink Coins, buy the Mystery Key at the Cliffs shop, then use it on the pink door.
