Double Credits (Asphalt 8)

Double Credits is a powerup in Asphalt 8: Airborne, which doubles the amount of Credits earned in a race. As with other boosters the Double Credits powerup is effective a certain time during which all the races a player starts are affected.

Usage
The Double Credits booster can be used before the race using a booster selection before starting a race (if you don't have one, it costs 100 Tokens to activate one unit). Each unit lasts one whole day (24 hours). During this period, the the amount of Credits earned in a race will be doubled. Unlike other boosters, the Double Credits powerup cannot be replenished by finishing certain collections, and it can only be obtained in certain Apex Wednesday Tokens cups.

If the Double Credits boost is activated, a boost icon will appear in the main menu along with a timer indicating how long the boost will last. A timer will also appear on the Boosts-screen indicating the remaining time of the activated boost. When not activated, the Double-Credits bonus shows a greyed out 0.

Trivia

 * It is the rarest powerup in the game, as it cannot be replenished by any collection and is rarely awarded in Time-Limited Events.
 * It is the only powerup that does not affect your race results (other than the credits earned by winning).
 * As a result, this powerup does not show up in the Leaderboards.
 * In the original version of the game this powerup could be replenished by win streaks but now it cannot be.
 * This powerup can be duplicated with the Daily Credits bonus and will stack with it for a 4x multiplier of the initial credits payout.
 * The Double Credits booster (with Nitro Starter (simply called "Nitro" at that time) and Tuning Kit) was added in Update 1 in November 2013, when the game was made freemium and a new car was added along with Time-Limited Events and customizable controls. (source 1, source 2)
 * The Double Credits can be earned from certain Car Mastery challenges, notably the Ferrari 612 Scaglietti, the Ferrari F40, Ferrari F50 and the AC 378 GT Z, all being Challenge 5 rewards. Also at the Car Mastery of the Lamborghini Egoista at the Challenge 10 reward.