66 Percent is a free game developed by Jiří Sýkora for Android devices. The game's objective is to fill 66 percent of the screen with balloons and reach the highest level possible. The game is easy to play, you just need to long-press on the screen to inflate the balloons. However, you need to avoid the grey offensive balls that can pop your balloons.

The game also features a gravity challenge where you can flip your phone to block the offensive balls. This challenge makes the game more interesting and provides more options to play. The game is perfect for those who want to beat their friend’s score and share their highest level.

Overall, 66 Percent is a fun and challenging game that is easy to play but difficult to master. It is perfect for people who want to pass the time and enjoy a fun game on their Android device.