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.