Keys

Keys are a currency in My Singing Monsters. First released in the Version 1.4.2 update, they have a variety of uses, mostly relating to obtaining uncommon Monsters.

As of Version 2.0.0, the old icon for the currency Keys () has been replaced by a newer version ().

Uses[]

Keys are used for the following purposes:

Purchasing the Dipsters. Each Dipster costs 1 on Plant Island, 2 on Cold Island, 3 on Air Island, 4 on Water Island, 5 on Earth Island, 3 on Fire Haven and Fire Oasis, 6 on Light Island, Psychic Island, Faerie Island, and Bone Island, and 7 on Ethereal Island and Magical Sanctum. Only 10 Dipsters of each type can be purchased on each island.
Evolving Fire Monsters on Amber Island using the Crucible. The number of Keys used for the Crucible will depend on the number of elements the Monster has.
Unlock evolving for the Wublins. After unlocking it, a new inventory is added, with the previous required eggs being replaced by their Rare counterparts, which must be filled for the Wublin to evolve to its Rare form.
Unlock ascension for the Celestials. After unlocking it, a new inventory is added, which must be filled for the Celestial to ascend to its adult form.

Sources[]

As gifts from friends after level 8. One free can be received every 7 days (formerly every 30 days) per Friend. There is no way to find out who sent it. It is worth trying to contact any real-world friends or internet friends as to whom gifted you the key.
The Daily Login Bonus on or after Level 10(?) gives 1 key on Day 5 and 3 keys on Day 9.
In exchange for real-life currency, for a maximum cost of $5.00 USD per key. Collection of Keys costs $20.00 USD for 5 keys, while Lone Key costs $5.00 USD.
As one of the prizes on the Spin Wheel.
As one of two 'top prizes' (1 Key and 3 Keys respectively) in the Memory Game.
Getting to Tier 1 in Versus mode in The Colossingum.
Bonus Item of 1 from Monsters that can produce Bonus Items.
Certain days of the Colossal Conundra can give 1 or 3 .
Adult Celestials can produce 1 in addition to Treats, Diamonds, Coins, and Shards.
Collecting from the Nexus Nucleus in addition to Shards, Treats, Diamonds, and Wildcards.

Gifting[]

After level 8, one free can be gifted every 7 days to one friend (Formerly every 30 days) through the Friends menu.
Sending a Key does not remove it from the player's own Key inventory.
The recipient will not know the player who sent it.

Strategy[]

You can find a key exchange player, where you both gift each other your weekly key.
Save your Keys until there is a Dipster Sale, where their cost is reduced to 1 .
It is not recommended that you buy Keys with real-world money. You should be able to naturally produce enough Keys to sustain a decent growth in Dipster collections across all of your islands without needing any form of micro-transactions.
When it comes to Crucible evolution, it is recommended to set the heat up to the max as to increase the chances of success, which reduces attempts and therefore saves the amount of keys that are spent.
Play the Memory Game every day for free keys. If you don't get the 3 key prize on your free attempt, you can spend 2 diamonds to get it on your second attempt. There is also a 1 key prize.