Difficulty Guide
What changes from Easy all the way to Expert.
As difficulty rises, the grid gets bigger and the number of arrows increases. The rules stay the same, but the arrows get more tightly tangled, making the order harder to read.
Easy is for getting comfortable with the rules, Medium is a well-balanced round, and Hard and Expert are challenges that require thinking several moves ahead.
If it's your first time, start on Easy to get a feel for it, then work your way up. Each difficulty keeps its own separate best record.