Push those buttons on the keyboard while playing to get the desired effects. Some work only when actually walking around Dragonvale, some even in the title screen.

Code	Effect
Q	Instantly quits the game.
L	Loads the most recent saved game.
M	Press to stop Lydia from moving. Zak will still try to move where you click, but will usually return to Lydia. Press again to regain movement.
S	Saves the game.
T	Some debug informations will appear on the screen. Press again to make them disappear
/	Warps to a debug room with warps to all rooms in the game (works even in the title screen). Entering some warps might crash the game.