To play against a friend in Soccer Physics Online, both you and your friend need to be online. You can either invite them directly through the game's friend system or use a shared code to connect.

Yes, Soccer Physics Online is primarily designed for two-player mode where you can challenge either an online player or a friend. However, there might be single-player practice modes available for skill improvement.

Currently, character customization options are limited in Soccer Physics Online. The focus is more on the gameplay and physics of the soccer matches rather than extensive customization.

Soccer Physics Online is an online game, so it should be accessible via web browsers on most devices including PCs, tablets, and smartphones with internet connection.

Soccer Physics Online emphasizes realistic physics, which means the ball's movement, collisions, and rebounds are based on real-world physics, providing a unique and challenging experience.

Progress saving in Soccer Physics Online is not supported as it is a quick-play online game focused on short matches between players. Your stats and achievements may be tracked but not your specific match progress.

If you encounter cheating or unfair play, most online games have a reporting feature within the game settings. Look for a 'Report Player' option and follow the instructions to alert the game moderators.

While there might not be a dedicated tutorial section, the game’s intuitive controls and quick start matches can help beginners get familiar with the game. Additionally, watching gameplay videos online could provide useful tips.