Angry Birds

Angry Birds collapses its entire control scheme into a single drag-and-release gesture on the slingshot. There's no movement and no aiming reticle — you pull back, and a dotted arc of fading trajectory dots previews where the bird will fly, teaching projectile physics without a word of text. That trajectory trail is the tutorial. Each bird's special ability triggers on a second tap mid-flight, layering depth onto the same gesture. The level-select map and the three-star scoring strip at the end of a round turn failure into legible feedback: you always see exactly how short you fell. The interface trusts the player to learn by watching consequences, which is why a toddler and an adult can both pick it up cold.