If you liked GROW and GROW RPG, you'll also enjoy GROW: CUBE.
HINT 1: The ball goes last.
HINT 2: The ball needs LONG tube to be completed.
HINT 3: The little people have to do lots of work, they have to go first.
HINT 4: Everything needs to grow - water goes second, right after the people.
HINT 5: No more hints. :)
UPDATE: WTF? You can switch the last two items (i.e. the ball goes second-to-last) and you also get "perfect ending", the same as I did (see talkbacks). This shouldn't be right...???