Tap, click, or press space to flap. Thread the gaps without touching a pipe or the ground.
Tap the screen, click with your mouse, or press the space bar to make the bird flap upward. Gravity pulls it back down constantly, so you need a steady rhythm of taps to stay level. Fly through the gap in each pair of pipes to score a point — touching a pipe or the ground ends the run.
Small, frequent taps give you more control than a few big ones. Try to keep the bird near the vertical centre of each gap rather than diving in from the edge, since that gives you more room to react to the next pipe.