1Every day there are five glasses, getting harder as you go, each with a target, like Fill to 54%. It's measured by volume, not height.
2Hold anywhere (or Space) to pour, and let go to stop. The longer you hold, the faster it flows.
3Top up as often as you like, but you can't pour water out. The glass has no markings, so read its shape: the level rises fast where it's narrow and slowly where it's wide.
4Tap Done to lock it in. A perfect pour scores 100, and every 1% you're off costs 5 points: 2% off scores 90, 10% off scores 50.
5Play every day to build your streak and unlock achievements (the trophy icon). Missed a day? Every past pour is in the archive (the calendar icon).