Pick up three hint coins
Carefully examine the water in the pool
150 Half as Old (US) / Sisterly Sums (UK)
Hint 1
Hint 2
Hint 3
Super Hint
Solution
The little sister is 9 years old
Progress
3985 Picarats and 266 Hint Coins
112 Beams and Ladders (US) / Ladder Puzzle (UK)
This free video game walkthrough is for the Nintendo DS
Professor Layton and the Unwound Future Walkthrough
Professor Layton and the Lost Future Walkthrough
Professor Layton and the Unwound Future Walkthrough
Professor Layton and the Lost Future Walkthrough