Purpose of “extras” – Pearl's Peril - Hidden Objects Review

I’ve been playing Pearls Peril for some time. I know the purpose of coins and lighting bolts but don’t know what the purpose of butterflies, wood, compasses are. How do I use these when I earn them? Is there a tutorial site I can visit? Plus, lately my game has been “stalling”. It’s most frustrating during timed events when the item you find freezes for upwards of 2 seconds. Hopefully this latest update will fix that issue.
Review by Lhawk50 on Pearl's Peril - Hidden Objects.