Onet 3: Ultimate Challenge Mahjong Connect 2020 by Puzzle Blast Mania is a free puzzle game available on the Android platform. With its deluxe HD design and hundreds of levels, this game is sure to keep you entertained for hours.

The gameplay is easy to understand - you just need to connect a pair of cards within three lines. This game offers three different modes, including Untimed, Standard, and Challenge, with each mode having an option to set the difficulty. Additionally, there are three help buttons - Hint, Addtime (30s), and Shuffle - to assist you when you get stuck.

One of the best features of Onet 3: Ultimate Challenge Mahjong Connect 2020 is the ability to collect gems in-game to unlock new themes. With over 1700+ challenging levels, this game will keep you hooked for a long time. You can also connect to GPlay Games for leaderboard and achievements.