Tap the "Menu" in the lower-right corner to pause game play. Then tap the screen around the buttons ("Continue", "Skip puzzle" etc.) in the order listed to view the solution of that puzzle. When entered correctly, the game will resume and the puzzle will solve itself by moving the snakes automatically. Three coins and the text "Cheater!" will appear will confirm correct code entry.

Blue puzzle set: Top, top, bottom, bottom, left, right, left, right.
Green puzzle set: Left, left, right, right, top, bottom, top, bottom.
Orange puzzle set: Right, bottom, left, top, left, bottom, right, top.
Red puzzle set: Top, bottom, left, right, top, bottom, right, left.
Teal puzzle set: Bottom, bottom, top, top, right, left, right, left.
Yellow puzzle set: Right, right, left, left, bottom, top, bottom, top.