Rubies in Mario Kart Tour are rewards you receive after races and completing quests that can be used to 'Fire the Pipe'. The Pipe (Gacha) fires karts, drivers, and gliders for you to use in races. You start the game with 20 Rubies and it takes 5 Rubies to 'Fire the Pipe'. This How to Get Free Rubies guide will tell you how you can get more Rubies without having to use real money to purchase them.
Tour Gifts
Play through the game to get various tour gifts, in those gift packs you'll sometimes get free Rubies. Remember to not let these gifts expire, as you only have a certain amount of time to remember to collect them
Level Up Rewards
As you play through the game you will gain XP. When you reach certain experience milestones you will level up and earn some Rubies for free.
Ranked Cups
You can participate in ranked cup races for a chance to win Rubies. The higher up you finish in the ranked races the more Rubies you'll potentially get.
Paid Ways to get Rubies
The option to purchase more Rubies from the game shop is always available. You can also boost the amount of Ruby rewards that you get if you purchase the Gold Pass Subscription. The Gold Pass is a monthly-subscription service that grants the user additional rewards during tours, and exclusive items such as badges from Gold challenges. The Gold Pass also unlocks the use of 200cc Karts. Items acquired while having a Gold Pass will remain in your account. You can purchase the Gold Pass Subscripton at the in-game shop or by tapping the banner located at the top of the main menu.
Check out our Grand Stars Guide to find out how you can farm Grand Stars to purchase new cups, characters, and other tour gifts from the in-game shop.