Plain mechanics define this bottle filling challenge where gravity plays a tricky role. I found the tap and hold control simple but the physics feel wonky sometimes.
You must tap and hold to fill the balls, release to stop filling.
The control is tap and hold to fill and release to stop. The stated feature is that the physics feel wonky sometimes.
Most players must watch the fill level closely and release at the perfect moment. The tap and hold mechanic requires perfect timing.
Q: What are the controls? A: Tap and hold to fill, release to stop.
Q: What is the objective? A: Fill the balls.
Q: Is there a timer? A: Not stated.
Q: What is the main mechanic? A: Tap and hold to fill and release.