“Tetris is not a puzzle to be studied, but a reality to experience. You must play and flow with it.”
— Galactoid
Thank you for buying this Tetris guidebook’s physical version! Its digital version is entirely free on my howtotetris.com website.
About the Author
Hello! I am Aquila Goh, often known as Galactoid, the creator of the Galactoid Tetris WordPress and HowtoTetris guides (10 Tetris books in total).
I am a Tetris 99 main and an exceptionally efficient Tetris player, having completed 510,000 T-spins. I have a T-spin-per-line-clear ratio of 0.2-0.25 (top-tier). Here is a screenshot of my account as proof of my qualifications in teaching Tetris. I go by Ei’lara on Twitch and Tetris 99:

I have played Tetris since 2020, and it has become my obsession. I often terrorize Tetris 99 lobbies by pulling off 100 T-spins in some matches.
I have spent 7 years experimenting with and testing Tetris techniques to find the most viable, streamlined methods. My Galactoid Tetris WordPress website has nearly 100 guides in every Tetris skill area.
Here are some of my Tetris feats from my mid-game streams on my Twitch channel below. I create them at 1.7 to 2.2 pieces per second. Notice the clean stack and minimal T-piece waste. These are Tetris 99 screenshots:


The screenshots above demonstrate my Tetris finesse, mid-game mastery, and experience, and I hope they can help guide others.
With nearly 3,000 hours of playing and researching Tetris, I have distilled my experience into this guide to help you master Tetris.
The Goal of This Guidebook
Although I have written many Tetris guidebooks, they all explain and describe methods, theory, strategies, tactics, and application.
I have yet to write a Tetris guidebook that provides an overarching, step-by-step training procedure. This book serves that purpose.
This book shows you 2 things: (i) how to train for Tetris, and (ii) what you should note while training.
This book is complementary and should be read alongside the other books.
I targeted this book mainly at beginner and intermediate Tetris players who want a panoramic view of how to train.
Plenty of online Tetris guides are inconsistent. Likewise, many Tetris coaches have prescribed many different ways to train without a unified perspective. While their intentions are good, their advice is sometimes vague.
This guide addresses that problem by creating a synergistic approach based on a unified, empirically tested procedure for training Tetris more effectively.
Enjoy the Book!
While I strive for perfection, a few errors may remain, as I self-published this book with limited manpower.
This book series’ official website is https://howtotetris.com/
My Tetris research blog is: https://galactoidtetris.wordpress.com/
My Tetris tutorial YouTube channel is:
www.youtube.com/@GalactoidTetris
My HowtoTetris website contains an errata page that catalogs all errors found in the book series, which I will update frequently.