The next tetrimino is determined by a random number, which is deterministic and predictable. You can start playing from any seed without moving the timer by following these steps.

1. Play in Endless mode, Speed 20 and save the cursor position
2. Press the reset button
3. Press the start button repeatedly to start Endless mode as soon as possible (Random numbers advance every frame on the menu screen)
4. Identify the random number position from the following generation order table https://gist.github.com/absindx/f3d76ad5f8eb05e3ae8ecd4f04b47086
5. Game over at a specific sequence position
6. Select Try again to get any fixed tetrimino sequence (Timer start) Because of the correction that avoids continuous generation of the same tetrimino, some of them may not be on the table after the game starts soon.

RNG Manipulation can make a big difference in competitiveness. When the player using that appears in, I suggest to separate the categories.

I understand your explain. But, how can we identify the RNG manipulation? I thought it was difficult to specify whether the RNG manipulation was used or not.