Wolfoo Water Way is a free, gentle physics puzzle for kids 3-8: a seed waits for water underground, and kids dig the earth with a finger to open a path so water from the pool above flows down under gravity. The moment water touches the seed it sprouts — but water is limited so you must dig carefully, and purple rocks can't be dug, so you route the water around them. 15 levels get harder, with a single action — digging — yet many ways to solve each one. There's no timer and a wrong dig just means replaying the level. Kid-safe, right in your browser.
The game trains cause-and-effect thinking and physical intuition: kids must picture the route the water will take before digging, then see the result at once. Limited water and un-diggable purple rocks teach gentle planning and problem-solving. The sprouting-seed theme also introduces the idea that plants need water. Easy difficulty, no timer, no penalties. Free, inside the parent-controlled Wolfoo environment.