Managing your Currency

My Singing Monsters would be a completely different game without the many types of currency used in it. Due to the high amount of it that is needed to progress in the game, it is nice to save currency as best as possible.

Maximizing Earning Rates (Coins)
A monster can produce income in many different speeds based on its level, Happiness and species.

To maximize your earning rates, the monsters in your island should be decently fed, especially if you have rare monsters in your possession. As food will also take many coins to be produced, it is advised that you have a stable sum of them, by sharing the food you can between monsters with low and medium earning rates first, to avoid losing too much food on rarer, but more hungry, monsters.

Do not spend all your savings in food, though. Once you acheive certain levels, new monsters will unlock, and purchasing them is advised to progress in game.

Along with the constant Food Production, having a Unity Tree is also highly recommended, so be sure to save money to afford at least one of them.

Castle Upgrade or new Island?
Buying a new island surely is tempting, but it is not the best thing to do right away, as the castle upgrades that may be able to house the new monsters of that place usually cost outstanding sums.

Upgrading the Castles of starting islands to the highest levels possible would make your monster availability pool higher, meaning more income, which may be enough to purchase the desired island.

Diamonds
To obtain many diamonds, a player may need Mini-Mines. As only one mini-mine is available per island, many islands will be needed to acheive a daily supply of 5 diamonds or so.

If the player does not have enough many to spend on many mini-mines but visits MSM daily, only a few, or even just one mini-mine can be used as a start.

Daily visits are the key to obtain diamonds, as they are not added to your account after the mines do their job, but not every player can visit the game so often as this. Visiting as much as possible should do, but it will take many weeks until expensive Monsters can be bought via this method.

Shards
Shards can only be collected by players who once had level 15 Ethereal Monsters, so is highly recommended to a player that he or she saves as much coins as possible to buy food and castle upgrades, because it is though to feed an Ethereal monster until its teleportation point, and, as the process is currently irreversible, one may lose important income sources when trying to earn shards.

Even with this disadvantage, farming shards can also help you spare your coins, that, unlike the shards, are shared between may islands.

For example, when buying a Tub Fountain for the first time, 50.000.000 coins would need to be spent, but buying it with shards would avoid a big material loss on the natural islands while giveing you many coins by completing the Goal for placing the Decorations.