Enter the "Options" menu and select the credits screen. Once there, tap the "Snake Slider" text logo in the following order to display the debug menu. Tap the green "Snake" text once, the yellow "Slider" text three times, "Snake" five times, "Slider" seven times. If done correctly, the "Debug" menu will appear. This menu displays the current screen resolution and the puzzle set versions. You can unlock all puzzles, delete all hints (removed the hints received by rating the game), or reset all used hints.
View puzzle solution
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.