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
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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
Features:
– 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.