Plumber IV is a free puzzle game by IAVG GAMES, available on the Android platform. The game aims to connect all the tubes to power the robot by touching and connecting them one by one to form a complete tube. There is no time limit, but every time you touch a tube, the water in the tank will gradually reduce. The challenge is to ensure that the water in the tank does not run empty to reach three stars in each level.

The game has a total of 1000 levels with increasing difficulty as you progress. The graphics are simple yet effective, and the sound effects are pleasant. Plumber IV is an excellent game for those who enjoy brain exercise puzzles. It's easy to learn, but challenging to master. The game is suitable for all ages and is a great way to pass the time. Overall, Plumber IV is an addictive puzzle game that will keep you entertained for hours.