Secondly, Let's see the game details;

You may spend a little money will give you easy access to all those useful upgrades, gadgets, and some secret agents. Prices are starting from 2,500 Gems ($0.99) and   goes to 200,000 Gems ($19.99)

Moreover, you may see the gems prices downward screenshot.

urthermore, you may get some free gems also shown below screenshot.These are about the social media advertisements and easy to access. Facebook Like 500 Gems,  Follow Full Fat at Twitter 500 Gems, Sign up for mailing list 500 Gems, Rating Agent Dash on the App Store 500 Gems

 Secrets and Hints:

By investing in high-value gems leads you to become rich quicker! By upgrading the Magnet makes you to boost gem values as well as attracting all of it.

By using an air drop lets you to parachute down to the base entrance.Try to plan next play of your next step. One Step Ahead. It will help you if you dash when in mid-air or sliding.

Thirdly, more games give you to play advanced at game...

Air Drop (2,000 Gems): Land at the entrance to the first villain base.

Back-Up (4,000 Gems): Continue running from wherever you trip up.

Slow-Mo (3,000 Gems): Use your Time Dilation device to slow things down.

Gem Rush (2,000 Gems): Score high with x2 and x3 gems from the start.

At last, it will be better to use the gadget upgrades given below...

 These helpful items will give your agent that all-important edge. Even better, you can upgrade each gadget up to five times to make it even more effective. For Super Diamond,  try to pick up a rare jewel worth 10 gems. For jetpack, try to hold out your agent for two seconds.For magnet, try to attract all gems for five seconds. And lastly, for high-value gems, try to make Red (x2) gems appear.