It gets surprisingly difficult later on. Don't be afraid to wipe whatever you were trying and start from scratch. I've spent 20-30 minutes on a single bit of puzzle only to clear it all and solve it in 3-4 minutes.

It gets surprisingly difficult later on. Don't be afraid to wipe whatever you were trying and start from scratch. I've spent 20-30 minutes on a single bit of puzzle only to clear it all and solve it in 3-4 minutes.