Dora and the prince
In this chapter
Dora's door key, Dora the frog, and the prince on the ground floor who undoes Zaks' spell and gives his crossbow.
From Grand Dizzy's landing, drop down to the third floor's far left: Dora's door key lies there (Finding Dora's door key). Ride Dylan's elevator up to the sixth floor and open Dora's hut.

"Oh no! Dora's been turned into a green frog by the evil wizard Zaks. Can you help break his evil magic?" Pick up Dora who has been turned into a frog! and carry her all the way down to the village's ground floor.

On the ground floor's left, by the old tree with the ladder, stands the prince. Drop the frog beside him: "The prince kisses the frog and instantly Dora returns. He is so pleased he gives you his crossbow." (A frog in Dora's hut)
The crossbow with lots of bolts lands at Dizzy's feet. Take it along; it turns out not to be needed (The archery on Castle Street).