Routing Order: The Real Strategy in Colony Flow! Hard Levels

Think of every level as a dependency graph: some pairs block other pairs. The pair whose route seals the most corridors must go first. The pair that crosses another color's route must go before the pair it crosses. The pair in the tightest corner goes early — corners can only be entered one way.

In practice: scan the board, find every corridor that only one color can use, and route those colors in order of how much space they consume. Save the center pairs for last, when the edges have opened enough room. This framework solves more hard boards than any individual trick.