Read the arrow
Each piece is a continuous arrow path. The arrowhead tells you which way the entire piece will slide.
RULES
How to Play Arrow Game
Every arrow moves only in the direction of its head. If another arrow blocks its route, clear a different path first.
Check the route
An arrow can leave the board only when no other arrow occupies any part of its escape path.
Find the order
Some arrows unlock others. Work from the clear routes toward the blocked ones until the board is empty.
Arrow A points right, but B occupies its route. B points up and has an empty route. Remove B first, then A can slide out. The important clue is the obstruction between the pieces, rather than their colors.
Read the entire arrow, including its bends
The arrowhead gives the movement direction. Every cell in that piece slides in the same direction: the piece does not follow its bent line like a train on a track. Imagine the whole shape moving one square at a time.
A head can appear to have an empty lane while the tail would hit another piece. Check the parallel lanes swept by the rest of the body. When a move is blocked, the marked collision cell shows where the contact occurs.
Work backwards from a blocked piece
Choose a piece you want to remove and inspect the arrows in its swept area. If a blocker is also trapped, follow its blocker next. Stop when you reach a clear route. Removing that piece begins to unwind the chain.
There can be several valid removal orders. A legal removal only takes occupied cells away, so it cannot make the remaining board less solvable. You do not need to restart just because you chose a different legal arrow.