LEVEL 138 Turn on the least switch to get water! – Brain Out – ANSWER. Do you want to test your IQ level? Then try to complete the fascinating Brain Out puzzle. Here we will need to go through level after level, using non-standard thinking, ingenuity and creativity. The puzzles may seem absurd, but don’t judge by first impression. Blow your brain going through this puzzle. The answer can be very obvious, and sometimes not so much. Train your brain with this puzzle. Invite friends or family to play together. Train your memory and logic by passing levels. If you can’t pass the level yourself, then you can use the tips on our website and do it with ease.