Rainbow Friend Cartoon Jigsaw

Rainbow Friend Cartoon Jigsaw is listed here under Boys. There is no launcher and no install between you and it. Taps and swipes are the whole vocabulary — a phone plays it best. Tagged 3d, android, boy, brain, cartoon.

It is drawn for a tall screen, so it fills a phone held upright rather than a wide monitor. Close the tab and come back later; the game is still one click away.