Every game you play earns Coins, to progress you will need to invest these Coins in Tower Upgrades which can be found by clicking the Upgrade button on the main map screen.. These upgrades allow you to access stronger towers in levels, these towers are key to your victory in later levels!
To boost your defence be sure to use Reinforcements and Airstrikes, if you are lacking Infantry or are out of Tesla charge they can save the day!
There are 4 core towers to construct in Alien Creeps TD:
Infantry - Build a barracks and the troopers inside will attempt to stop and slowdown any Creeps coming towards them.
Machine Gun - A fast firing direct damage tower, cheap to construct and fast to jump between targets.
Laser - A focused energy beam with high damage but long reload times. More effective against Shielded enemies.
Rockets - Slow firing but each Rocket packs a punch damaging any units in close proximity
There are 4 key towers you can place in a level, each tower has 3 upgrades and 2 abilities to unlock. These can be unlocked by purchasing upgrades via the upgrade section, then you must use the unlocked tower upgrade option to progress your towers mid action.
Every level starts with 3 charges in your Tesla Tower, once these three charges are used you can get 3 more charges using Gems.
Everyday General Steele will send you a Care Package for FREE containing a number of Reinforcements and Airstrikes. These can be collected by entering the settings menu from the main map screen, and pressing the mail button.
To get more you can get more in game using Gems or you can connect with Facebook and share Care Packages with your friends, each Care Package contains free Reinforcements and Airstrikes
If you run out of either Reinforcements or Airstrikes during playing a level, you can purchase more using Gems
Energy is used in levels to construct towers and your defences.
You begin every level with energy and can earn more by killing Alien Creeps, different types of Creep reward varying amounts of Energy
You can also gain more energy by calling in waves early. Simply tap twice on the Wave Herald to call a wave in early.
Challenges are short bursts of intensive gameplay design to test your mettle in combat
Challenges unlock after you complete level 9 of the campaign and you can unlock more by progressing through the main campaign
You can earn Coins by beating challenges. As you progress through the challenges, the difficulty rises but so do the rewards.
Coins are used to begin upgrading your towers and to train your Heroes
You can earn more Coins by completing levels and through Hero kills. Heroes will earn Coins for every enemy they attack!
Gems can infrequently be dropped by some Alien Creeps in the heat of battle, typically the only way to get more Gems is to purchase them in the shop.
Stars are earned by completing levels. For Campaign levels, you are awarded 1 star for finishing a level, 2 stars for completing the level whilst losing only a few lives and 3 stars for completing a level whilst not losing a life.
You are awarded one star for completing Veteran levels and one star for completing Spec Op levels
Connect with Facebook and your progress is saved to the cloud and can be taken to other devices.
Simply sign in to ACTD on your second device and you will be prompted to merge progress
All the heroes can now reach Level 20. Look for further expansion in forthcoming updates
We have implemented a new feature where you can use 2 of your heroes in battle. Simply select which ones you want to use before entering gameplay.
You can invite friends by pressing the Comms button on the lower left-hand corner(shown as an envelope symbol)
Sign into Facebook and then press the send gifts button, click the invite friends button and select the friends you wish to invite.
To send Care Packages simply press the send button next to each friend to send them a care package or click the Send All button to send to all your friends at once
When they send you a care package you will receive a message and be able to collect them via the collect buttons
If you want to play Alien Creeps without any interruption, you can make any purchase and this will remove the adverts.