Want to know how to earn Gems fast in Universal Tower Defense? Like most gacha-based games, expanding your unit collection means summoning a lot and hoping to pull high-value units like Mythics. To do that, you’ll need a serious supply of Gems. Luckily, I’m about to show you the best AFK Gems farming strategy in Universal Tower Defense.
How to Farm Gems Fast in Universal Tower Defense
If you don’t want to waste hours grinding Gems just to keep summoning units, you’re in the right place. At the moment, the most effective AFK farming method is setting up a Universal Tower Defense macro that does the work for you. While that might sound complicated at first, it’s actually fairly easy to set up. Before we dive into the setup process, let’s take a look at the best location for farming Gems.
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Best Farming Game Mode
The best way to farm Gems is by playing Story Mode, with Act I of the first stage (Ninja Forest) being the most efficient option. Later stages don’t reward more Gems, and the same applies to higher difficulty levels. The only factor that directly affects how many Gems you earn is the difficulty meter - the higher you move the slider, the more Gems you receive upon completion. Thus, in order to keep farming Gems AFK, the best thing you can do is to set up a macro for Act I.
The first thing you’ll want to determine is how far you can push the difficulty slider without making the stage too hard to complete. Your goal is to find a sweet spot where you can still clear waves safely while maximizing rewards. The higher the slider goes, the more Gems you’ll earn. Although the slider can reach 1000%, it’s usually best to start around 200–300% and adjust upward from there.
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AFK Macro Farming Setup
Once you’ve figured out the best farming difficulty for your setup, it’s time to configure your macro. This is the most important part, so pay close attention. It isn’t difficult, but you do need to follow each step carefully, since even small mistakes can break the loop. Here’s how to set it up, step by step:
- Download and install a macro tool like InformalTask (recommended) or TinyTask.
- Familiarize yourself with how the tool works.
- Play through the entire stage once, clearing all 15 waves until you reach the reward screen.
- Do not claim the rewards yet.
- Open InformalTask and press Ctrl + R to begin recording your macro.
- IMPORTANT: From this point forward, only perform the inputs you want recorded - any extra input can break the macro.
- Click the screen 5–7 times to collect all rewards.
- On the Victory screen, click Replay once.
- Click Skip once.
- Place your farming unit.
- Click x1.5 to speed up the stage and improve farming efficiency.
- IMPORTANT: Do not move the camera while recording. Camera movement will break the macro; only move your mouse within the visible screen.
- Play through the stage normally by placing and upgrading units, but make sure not to move the camera.
- Once the reward screen appears, don’t claim the rewards. Instead, press Ctrl + R to stop recording.
- Finally, press Ctrl + L to loop the playback and start running your recorded macro.
Common Macro Mistakes (Read Before Recording)
- Do not move the camera while recording, this will break the macro.
- Do not press any extra keys or click outside the intended inputs.
- Make sure your screen resolution and UI scale stay the same.
- Always start recording from the reward screen, not mid-stage.
- If the macro desyncs, delete it and re-record, small mistakes pile up fast.
Universal Tower Defense Gems Farming FAQ
No, the developers don't condemn the usage of macros in Universal Tower Defense, but will try to make it harder to do it in the future.
If you’d rather avoid using macros, you can still earn Gems naturally by playing the game. This includes completing quests, unlocking achievements, claiming daily and weekly rewards, finishing Index and Level milestones, and purchasing Game or Battle Passes.
In general, InformalTask and TinyTask are considered the most reliable options. While you can experiment with other macro tools, there’s a broad consensus that these two perform best.
In general, just use your strongest team comp, as you’ll also level it up along the way. There is no special team comp for this purpose.
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Nikola is a Senior Staff Writer at Pro Game Guides with over 13 years of experience in gaming journalism. He has been playing video games since his father bought him an NES and a Sega Mega Drive in the early 1990s. Over the years, he has mainly become a PC gamer with a love for narrative-driven RPGs, real-time strategy games, and psychological/survival horror titles. Still, he enjoys any game that’s worth his time.
