Thanks to the freedom thatRobloxprovides for creators, you have the option to enjoy titles like Toilet Tower Defense completely free of charge. However, that won’t prevent these games from encouraging you to get their currency, which may cost real-world money depending on the game.
That being said, there are free ways to earn the coveted Gems in Toilet Tower Defense as long as you can meet the challenges posed to you each day. While it won’t be as fast as outright purchasing them, you can still find enough Gems to unlock new units and other items locked behind the currency.

How To Get Gems
The primary way toearn free Gems is by doing Daily or Weekly Quests, which can be found on the left side of your screen as apurple circle with a blue bookinside of it. Timers show you how long you have to complete each quest before they reset.
The reward isfive Gems for Daily Questsand20 Gems for Weekly Quests.

There areother ways to get Gems,too, with varying results, including:
As you further progress in Toilet Tower Defense, you’ll likely havea higher need for Gems to get better units. As your appetite for the currency grows, you’ll likelyneed to take advantage of different ways to get more Gems.
When you finally get enough of the currency, you may use it on things likeCrates, whichwork as randomized unit dropsthat have a chance for rare items. However,these start at 200 to 500 Gems each, which is hardly what a new player can afford.
Gems are theonly currency that can be usedat theMarketplacein the Trading Plaza, with evencommon units going for a fair amount.
If you don’t want to purchase any Gems and only want toacquire them for free, you shouldbe diligent about checking in and completing the questsonce they reset. In addition,learning how to trade and sellcan be a great way to earn more Gems for free.
Summoning units with coins and thenselling them on the Marketplacecould be a great way toflip any unwanted units for Gems.