Two Cars

The dual-attention reflex classic. There are two cars on two side-by-side tracks of two lanes each — and you're driving both at once. Tap the left half of the screen to swap the left car's lane, the right half for the right car. Each car must collect every green circle in its track and dodge every red square. Miss a circle or clip a square and the run ends. The real challenge is splitting your attention across both tracks as the lanes speed up each level.