Help!

[Megadog]

I need help in the following points!

1) Where is happy glade?

2) Where is the last journal piece(19)?

3) I've come across the puzzle by the lake and after the while the tiles became ??? tiles!

[Zaratus]

I can help with the first two.

First, the Happy Glade is hidden in the Sleepy Forest. Look carefully on the far edge of the forest.

The missing journal page is there as well.

Umm, as for the lake puzzle? I don't think the standard fix will work there, as there's no backwards switch from what I remember.

[Megadog]

4) the Headless Horseradish blew up his head!