Just Clear All Cheats
1 Block left at the end of stage is possible. However it is very difficult to achieve!
Getting a 1 Block left would give you high amount of score.
But you can get a 1 Block left at the stage 1 of "Just Clear All"
When you start a game, the game will give you a randomly placed blocks on every stage.
Luckily when you play the Tutorial Stage (Through settings or at the pause menu) the game will give you a fixed blocks placement.
When you finish the Tutorial Stage or the Stage 1 of the Tutorial, your next stage would be the same if you played it at the Main Menu.
You can get the "1 Block Left" in the Stage 1 Tutorial by following these image below.
You will get a 2,865 score at the end of the stage 1.