I've recently spent way too much time playing Hordes of Orcs and I recently found a solution to beating Hordes of Orcs "Crossroads" on the Impossible difficulty setting. So for those of you googling for it, here's two (!!) solutions without selling anything.

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Two solutions

1. Maximize the number of towers firing per second. This results in an aesthetic spiral shape.
2. Funnel the orcs down one path and maximize splash damage. This results in a grid-like structure, or something more wavey.

• Arrow Towers - All Level 1. Target: "Fastest"
• Ice Towers (3) - All Level 4/5. Target: "Fastest"
• Radiation Tower (1) - Level 4/5. Target: "Most Neighbors"

There's also a cute Easter Egg such that the game becomes Hordes of Pork.