To start playing Subway Surfers London 2021, simply download the game from the App Store or Google Play, then create an account or log in if you already have one. Once logged in, you can begin your adventure by tapping the play button.

The main objective is to run as far as possible while gathering coins and avoiding obstacles and trains. You also need to dodge the inspector who is trying to catch you. The longer you survive, the more points and rewards you can earn.

Yes, you can customize your character by collecting different outfits and accessories. These items can be unlocked by playing the game, completing missions, or purchasing them with coins or gems.

Yes, there are often seasonal events and limited-time challenges that offer unique rewards. For example, during the New Year's event, you might find special items related to the theme like Santa hats or snow-themed boards.

New maps can be unlocked by progressing through the game and completing certain milestones. Additionally, participating in events or achieving specific goals may also grant access to new areas.

Subway Surfers London 2021 does not feature a traditional multiplayer mode where players compete directly against each other. However, you can challenge friends to see who can get the highest score or longest distance in their solo runs.

It's important to note that using cheats or hacks to manipulate the game is against the rules and could result in your account being banned. Stick to legitimate methods of earning rewards and improving your performance.

If you experience any technical problems such as crashes or lagging, try restarting the game, updating it to the latest version, or clearing the cache. If issues persist, consider contacting customer support for assistance.