G-20 ・ Puzzle ・ 3–8 min
Mizuyure — Make the ripples arrive together
A ripple puzzle seen from above a pond. Two or three flowers float on the water, and your job is to find the spot where a ripple reaches all of them at the same moment. Tap the water to drop a pebble; the ripple spreads at a steady speed. You get one stone per try, and you clear the stage when the arrival times differ by no more than the window shown. Miss, and each flower gets a small note such as “0.12s early” or “0.12s late” so you can correct your aim. The answer is never shown. The window narrows as you go, and later stages put the answer outside the triangle the flowers make. Your record is the total gap over all 10 stages.
How to play
- Tap the water to drop a pebble there and start a ripple (keep your finger down and slide to fine-tune; it drops where you let go)
- If the ripple reaches every flower within the window shown at the top, the stage is cleared
- Miss, and each flower shows how early or late it was. Move toward the late flowers to close the gap. Your last drop stays as a faint dot
- Clear 10 stages to finish. The smaller your total gap, misses included, the better
Keyboard: ←↑↓→ move the aim / hold Shift to move faster / Space or Enter drop the stone, next
Where the ripples meet
Ripples spread at a steady speed, so when one reaches a flower depends only on how far away you dropped the stone. The ripple reaches every flower at once from the point that is the same distance from all of them. With two flowers, that is any point on the line through the exact middle between them; with three, it is the single center of the circle through all three.
Reading the gaps
After a miss, each flower shows how far it was from the midpoint between the earliest and latest arrival. A late flower is too far away and an early one is too close, so move your next drop toward the late flowers. Your last drop stays on the water as a faint dot.
How the stages change
Stage 1 has two flowers and a generous 0.24s window. From stage 2 most stages have three flowers: the answer may sit inside the triangle, at the middle of its longest side, or outside it altogether. By stage 10 the window is down to 0.08s.
Records
Every stone you drop adds its gap, the time between the first and last flower it reaches, to your total. Misses count too, so fewer, more accurate drops give a smaller total. Your smallest total is kept in this browser as your best, and each new set builds fresh stages.
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