UNO!™ is free to download and enjoy on both iOS and Android platforms. It offers players the core experience of the worldwide beloved card game without any initial charge. However, while the game itself is free, it incorporates various in-app purchases. Players have the option to buy coins, which can be used to purchase cosmetic items or to participate in special events and tournaments.

Additionally, the app includes advertisements that can appear during gameplay or in-between matches. These ads can be removed or reduced by purchasing coins or through subscription packages. The optional purchases, while not necessary to enjoy the game, can enhance the player's experience by unlocking additional features or providing boosts to progress faster in the game.

Installation on iOS Devices: For iOS devices, UNO!™ is available for iOS version 10.0 or later. To install, open the App Store on your device and tap on the search icon. Type "UNO!™" in the search bar and find the app developed by Mattel163 Limited. Once located, tap the 'Get' button, followed by 'Install'. You may be required to enter your Apple ID password or use Face/Touch ID for verification. During installation, the game may request permission to send notifications and access storage to save game progress. Ensure these settings align with your preferences.

Installation on Android Devices: For Android devices, UNO!™ supports Android version 4.1 and up. Open the Google Play Store and tap the search bar. Type "UNO!™" and look for the version from Mattel163 Limited. Press the 'Install' button to begin the download and installation process. Upon launching the app for the first time, you'll likely encounter requests for network permissions to access the online multiplayer features. Grant necessary permissions to enjoy full functionality, but be mindful of any privacy settings you wish to adjust.

Step 1: Start by launching UNO!™ on your device. You'll be prompted to log in or sign up using a preferred method either through email, Facebook, or other supported accounts. This helps synchronize your game progress across devices.

Step 2: After logging in, familiarize yourself with the main menu. Here, you'll find various game modes such as Classic, Quick Play, and Tournament. Each offers a unique twist on the traditional UNO!™ gameplay.

Step 3: To begin a game, select a mode, and you'll be placed in a matchmaking queue. While waiting, take a moment to explore in-game options or look at any notifications for special events or daily challenges.

Step 4: Once the game starts, review your hand of cards. The objective is to be the first to discard all your cards by matching them by color or number with the topmost card on the discard pile. Keep an eye on any special action cards you might possess, such as Skip, Reverse, Draw Two, or Wild cards, which can change the flow of the game dramatically.

Step 5: Progress through turns, and when you're down to one card, remember to press the 'UNO' button before anyone lies about declarations. Failing to declare UNO!™ when you have a single card left will result in a penalty, so be vigilant.

Tip 1: Utilize Wild Draw Four cards strategically. Don't rush to play them; instead, save them for a critical moment to hinder opponents effectively when they are close to winning.

Tip 2: Pay attention to your opponents' discards as well as any challenges or reversals. Knowing which colors an opponent lacks will give you an edge, allowing you to play cards that force them to draw extra or skip their turn.

Tip 3: Participate in daily challenges and events, as these often grant coins and other rewards. These resources can be used to enter higher-stakes games or obtain valuable customization items, boosting your gaming experience.