Portals Experiment is a fun and challenging physics-based puzzle game that will test your problem-solving skills. Developed by IDEALUMP K.K., this game is available for Android devices for free.

The game revolves around completing experiments on test subjects by opening and closing portals at the right places using your portal gun. The puzzles are designed to trick your mind and require you to think outside the box to solve them. With each level, the difficulty level increases, making it more challenging and engaging.

The graphics are simple yet appealing, and the game is easy to navigate. The controls are intuitive, and the gameplay is smooth. Overall, Portals Experiment is an excellent game for those who love challenging puzzle games that keep them engaged for hours.