When tackling puzzles that combine simple arithmetic with game references, like "31+13-25=?" alongside names such as Ruby and Aurawalk, using a stylus pen can dramatically improve your precision and interaction on touch devices. From my personal experience, the stylus pen provides a more accurate way to select answers or navigate through puzzle options, which is often essential in timed or level-based challenges. This particular puzzle, although seemingly straightforward mathematically, might be part of a larger game mechanic requiring careful touch input for solution verification. Moreover, stylus pens facilitate handwriting input and can help in quickly jotting down interim calculations without losing focus, especially useful when multiple steps are required. During my gameplay, I noticed that integrating the stylus allowed smoother control, reducing input errors that frequently happen with finger taps. If you’re exploring similar puzzles, consider practicing with your stylus to improve your response time and accuracy. Also, be mindful of the game environment—for instance, if the puzzle is from a specific level like Level 1 in games featuring characters named Ruby or Aurawalk, learning their gameplay patterns alongside mathematical riddles can provide clues for efficient problem-solving. Overall, combining effective stylus use with strategic thinking not only enhances your gaming performance but also makes solving challenging puzzles more enjoyable and less frustrating.