There are multiple ways to acquire Tech Cards, which help you to seriously improve your game and should be considered a priority. You can get them by dominating the weekly war events (cards are then awarded randomly), or by purchasing them outright with diamonds.
Earn bonuses
Tap the boxes that fly overhead to earn bonuses such as those special skills, as well as free diamonds. Diamonds buy you all sorts of perks such as supercharging your business or making it rain, as well as new tech cards. If you have an internet connection you will get the option to watch a video for five diamonds - otherwise you'll get one diamond per box.
Easy diamond bonuses
One of the quickest free diamond bonuses is within the shop itself. Scroll past all of the goods that you can purchase, down to where it says Follow Twitter or Like Facebook. Do one of these or the other, or just tap the buttons and then go back to the game without following through; either way, you will earn 25 free diamonds apiece when you do this.
Free diamonds
Completing achievements is your other best method of earning free diamonds. Hit the red ribbon/medal button to see what the achievements on your list are that you can still complete. When the achievements icon has an exclamation mark next to it, then you will be able to go and collect your reward for a completed achievement.
Be sure to prestige as often as possible, because this makes it very easy to gain new experience levels. Each time that you gain a new experience level, you will get a diamonds bonus. If you have already reached an experience level in the past before you prestige, you won't get any bonuses for getting back to it, though.
High rankings
The higher your rank among your country's contributors of soldiers, the better that your bonuses will be. So for that purpose, switch to a smaller country on the list or a country without as many active players if you want to make it easy to get high into the rankings. Using a Make It Rain can also earn you quick angels and tech cards, although you're best off just spending 500 gems on 5 tech cards directly.
Improve revenue from taps (jetpack guy)
Don't forget to focus on the jetpack guy, which will appear on-screen and my give you presents. Once collected it may improve the revenue you earn from taps, or even to increase business revenue.
Jetpack Bonus
Always pay attention so you don't miss the arrival of the jetpack guy, who occasionally will appear on-screen to offer you a present. You can collect it to improve the revenue you earn from taps, or even to temporarily increase business revenue.
Leaderboards
Send your soldiers at regular intervals to get your name in the leaderboards for the next world war. You are automatically added to a specific country's banner when you log into the game; if you want to switch countries, delete the game and spoof your location with various methods, such as with a VPN set in one country, or even by physically going to the other country.
Mind Your Businesses
Early on, make sure that you purchase businesses as quickly as possible, and to upgrade them to at least level ten. Along the way, make sure you're also investing in auto-collect upgrades and improving your tap income, but businesses are key. Once you have a hotel and have upgraded it to 10 or so, then it's time to head back through and upgrade your early buildings to around level hundred, to take advantage of speed improvements.
Prestige points
Once you hit the $20 trillion mark, you will be able to prestige, which gives you prestige points, allows you to send soldiers into the international money war, and can even earn you bonus tech cards. Tech cards can also be purchased using diamonds, and they give you various speed or income multipliers, or even tap income multipliers.
Spend Diamonds Wisely
Diamonds are precious currency, and you can use them for Tech Cards and Perks. It's possible to use the Make it Rain perk to receive the same amount of income you would in the course of a normal 24 hours of play. If you take advantage of that perk, do it when it will do you the most good. Make sure you're businesses are generating maximum revenue or at least at a very high level.
Various Gameplay Tips
Tip 1: Use your premium currency on Tech Cards, but also on Perks. One of them is Make it Rain, which rewards you with 24 hours worth of income.
Tip 2: Send soldiers to help your country win the upcoming war and prestige faster and make a ton more money.
Tip 3: Win the Tech Cards in Wars or spend Diamonds for special items to improve your game.
Tip 4: Unlock more Special Skills (Superchargers) There are five of them.
Tip 5: Follow the game on Twitter and Facebook to get 50 Diamonds awards for free.
