Help Atom defend Earth against nasty aliens and evil robots! Take Astro Boy to the skies or fight on foot in this awesome tower-defense and action strategy game!

King, the tyrannical overlord of Planet X has sent his vile alien minions to plunder the Earth of its natural resources. Joining his cause are power-hungry robots who want to eliminate humans so they can take over Earth and turn it into their own technocratic dystopia. Help Atom and his friends prevent King's schemes from coming to fruition!

Join Atom and his friends as they fend off the alien invaders and the evil robots that help them. Take Atom to the skies or on the ground to fight both land and airborne enemies. Upgrade Atom and unlock valuable robotic power-ups. Pick up robot parts scattered across the battlefield and create your own robot army. Collect resources for Prof. Ochanomizu to repair and upgrade Atom and your army. Summon Atom's sister Uran, Box, and other special robots to help Atom finally destroy the enemy's portals and halt the alien invasion!

Features:
- Original Astro Boy art based from the original series
- Take to the skies! A unique combat system lets you fight in land and air!
- Exciting tower defense gameplay with a new twist
- Collect robot parts to build your own robot army
- Up to 50 robots to discover and build!
- Collect resources upgrade or repair ally robots
- Discover dozens of robots with different skills and classes to build
- Upgrade Atom's parts and arm him with powerful skills

** Please note that while the app is free, please be aware that it contains paid content for real money that can be purchased upon users' wish to enhance their gaming experience.You may control in-app purchases made within this app using password protection which can be enabled from the setting page of the Google Play Store app. **

// Option A //

To download Astro Boy Siege: Alien Attack mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Astro Boy Siege: Alien Attack mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Astro Boy Siege: Alien Attack from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Astro Boy Siege: Alien Attack in HappyMod App.