Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download 2D Endless Runner Kit Free.
2D Endless Runner Kit v1.07
This kit offers all the features needed to create your own high quality, mobile friendly, 2D endless runner game.
Demo | Forum | Guide
Also available in the Game Kit Bundle
– Unity 5 support
– Mobile friendly.
– Unity 4.6 UI support.
– Create obstacles, coins and power-ups using waves: arrange them in the scene view, put them in prefabs and let the magic happen!
– Object recycling for obstacles, coins, power-ups, background layers and particle effects for smooth performance on mobile devices.
– Power-ups: Spawn-able and consumable power-ups. Create and customize power-ups (duration, display on shop, upgrades, multiple effects).
– Customizable movement mechanic.
– Create multiple characters for your game, customize them and make them purchasable with in-game coins.
– Endless missions: Create missions using 14 types of unique goals and make them repeatable with increasing difficulty.
– Daily Challenge: Reward players with in-game items when they collect 3 items each day (consecutive days = bigger reward).
– Detailed documentation and fully commented code.