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Wolfoo Happy Cup — Draw a Line, Fill the Cup

Wolfoo Happy Cup is a free draw-a-line physics puzzle for kids 3-8: the cup is thirsty, a tap pours water down under gravity, and every line you draw instantly turns solid. Draw a channel to steer the water around obstacles, a shelf to keep the cup from sliding, a bridge to patch a gap, or a heavy block to tip the cup upright — fill it to the finish mark and the cup breaks into a smile. Your ink budget is limited, so draw cleverly; one single action — drawing — opens up a hundred solutions. 30 levels get harder, a bad line is simply erased and redrawn, and there's no timer. Kid-safe, right in your browser.

  1. Look at the tap, the cup and the fill mark to reach.
  2. Draw one line — it instantly becomes solid.
  3. Make a channel, shelf, bridge or block to guide the water into the cup.
  4. Save ink: fewer, tidier lines earn more stars.
  5. Fill the cup to the mark to make it smile and clear the level.

The game trains cause-and-effect thinking and intuitive physics: kids must picture where the water will flow before they draw, then see the result at once — learning by experiment, not theory. A single drawing action yet many solutions per level rewards creativity, and the ink budget teaches tidy, economical planning. No timer, no penalties — a bad line is simply erased and redrawn. Free, inside the parent-controlled Wolfoo environment.

How is this different from Save Wolfoo (also draw-a-line)?
Save Wolfoo draws a shield to protect from bees; Happy Cup draws channels, shelves and bridges to guide water into a cup.
What happens when the ink runs out?
Kids erase some lines and redraw more tidily, or replay the level — no penalty. Using less ink earns more stars.
Can a 3-year-old play?
Yes — early levels are very simple, needing just one straight line to guide the water; difficulty ramps up for older kids.
Is there losing or a timer?
There is no timer and no hard fail: if the water misses the cup, kids just erase and redraw until the cup fills.

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