To aim accurately, use the zoom feature to get a closer look at your target. Align the crosshair with the target's vital points for precise shots. Practice different angles and distances to improve accuracy.

Yes, you can customize your sniper rifle by upgrading its scope, magazine, and barrel. Collect in-game currency to purchase upgrades that enhance your weapon's performance.

Sniper 3D offers various game modes including 'Mission Mode', 'Survival Mode', and 'Sniper Challenge'. Each mode presents unique objectives and environments to test your skills.

Improving your score involves mastering aiming techniques, utilizing stealth to avoid detection, and completing missions within the given time limit. High precision and quick reflexes lead to better scores.