Wikileaks, though technically not a wiki, provides an easy means to disseminate information that some find it desirable to share against the wishes of those who find it desirable to keep secret. Aside from the morality of the leaking itself, such a service provides a look into the activities of...
Tapping the retry button instantly takes you back to the start of the level.
If a rock bounces into your mouth, you can catch it and use it again.
Always be on the lookout for ricochet shots, for they're the quickest way to clear a level.