@Xertiv Anon-kun you got it all wrong. It's part probability but the idea extends beyond that.
Basically you can reset the grid easily, but the timer starts the moment you do, thus you only get a half of a second to decide if the grid is potentially worthy or not. In my opinion you're not suppose to do every grid it gives you, but rather think quick when you reset the grid to decide if it's the one you want, and from there you still have to navigate the grid properly to maximize it's potential. So getting 70 and higher is to some extent skill based because you have to decide whether to take on the grid at a split second.
And sure it's probability, but that's part of the challenge, and if you play your cards right and use your skills to full potential you can use those probabilities in your favor. Fundamentally this game is sound and a very cool, fun, and addictive concept for something so simple.
Then again elegance is in simplicity.