Swiping by path, or dragging your finger to combine some cells feels a bit sluggish. Sometimes, it simply won't detect that we wanted to combine them. It seems to happen more often if one doing the movement a bit fast, like releasing on the last cell a bit early.
To reproduce:
go to the first tutorial.
Combine 3 + 6 = 9.
Restart the game to try again and repeat from step 2. (press r on the keyboard to restart quickly)
Swiping by path, or dragging your finger to combine some cells feels a bit sluggish. Sometimes, it simply won't detect that we wanted to combine them. It seems to happen more often if one doing the movement a bit fast, like releasing on the last cell a bit early.
To reproduce:
r
on the keyboard to restart quickly)