I think on that one I probably had to explain Abit more sorry if it confused you... The red button opens the tap so you just press that one for filling the glass and the green one changes the colors of the fluid coming out from the tap
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Okay, I got to the 4th level now. Getting the right percentages is pretty difficult since the glass is not filled to the rim and there is no mark for where 100% is. Sadly I clicked next too quickly after i failed which seems to sometimes lock the game. Still a pretty nice game, I really like the idea and making it on a phone is super impressive.