Bluff Master 420, also known as I Doubt It, is a free card game developed by Frimus for Android devices. It's a multiplayer game that allows you to play with Bluff Masters from all over the world or with your Facebook friends.

The game has a Single Player mode where you can brush up your skills against AI. It also has a variety of themes to choose from, adding a stylish quotient to your game. The in-game chat feature helps you socialize with other players and have fun.

Bluff Master 420 provides you with a share code that you can give to your friends to earn free coins. Additionally, you can play and earn free daily bonuses. The game also has an easy step-by-step tutorial that guides you through the game and makes it easy to play.