Try removing the DestroyInstance block from you blocks and inform me about the results
Blocks please sir?
iOS can not run extensions.
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are you using Android or iOS?
IOS. I read the comment above and looked it up and realized that my phone won't work however I may have a samsung at my house that may work.
in case you want to build the game with native blocks (exension-free), you can visit here: MAKE TETRIX GAME FROM SCRATCH IN APP INVENTOR 2 - 浮云小站
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There are loads of tutorials online on how to code Tetris, like
http://cslibrary.stanford.edu/112/TetrisAssignment.pdf
I found it by searching the web for tetris board size - Google Search
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iOS cannot use extensions, but you can try to make it work without using extensions 
So I am trying to make Tetris from scratch but I can't figure out how to change the block while still keeping the previous blocks at the bottom of the screen.
Also how do I rotate the block while it still moves down.
how do you make it ? with imageSprite or draw square on canvas? you need to have a list to store the state of the board.
How do you make that list. Is is a global variable with a list with a bunch of list inside the list?
and how do you make it with squares? i feel like that would be easier than making it with imageSprite.
see here Tetris : Recreation of 1980's Retro game - #50 by Kevinkun, but it's in Chinese now. Planing to change to English, but not finished.
Is there a way I can read it in english or do i have to wait for it to be translated?
the image can not be translated by online translator. And i can not guarantee when i will finishmy translate work. anyway you can do your version first.
See the guide at Tetris : Recreation of 1980's Retro game - #52 by ABG
If you don't like that one, look in the Google search results in that post for more step by step guides.
how do you make the squares through drawing