1. In 2050, Musk will truly complete the large-scale Mars immigration plan. Since Mars does not yet have a complete manufacturing industry chain, basic energy and equipment are mainly transported by the earth. With the development of technology and artificial intelligence, humans have begun to establish an ecosystem on Mars. In order to adapt to the Martian environment, humans have developed a large number of new species that combine biological and artificial intelligence, and some organisms have also begun to mutate.
2.In 2060, a small asteroid is on a collision course with Earth. Whether humanity will face an extinction event similar to the one that wiped out the dinosaurs is still unknown. Mars has completely lost contact with Earth, losing all information about it. The entire planet is enveloped in dense clouds, making it impossible for even probes to penetrate the inner atmosphere to investigate. Martian settlers can only rely on the limited energy and an imperfect ecosystem to sustain their livelihood.
3.However, the situation on Mars is not optimistic either. Initially, everything was relatively harmonious, but as resources became scarce, the situation began to spiral out of control. Without the support of Earth's energy supply and a large number of scientists, the technology of the Martian settlers began to regress.
4.In 2080, the conflict between the Martian settlers, intelligent robots, and mutated creatures became increasingly fierce. In the struggle for survival resources, the intelligent robots and mutated creatures began to besiege the Martian settlers, leading to a fierce battle for resources. The Martian settlers immediately formed a Guardian Alliance squad to counterattack, and whether they can withstand the waves of attacks has become the last hope for human survival.

Regarding the life forms: the Martian creatures are actually artificial intelligence-imitated organisms and genetically modified organisms from humans, merely appearing as if they are alien species. These creatures possess self-awareness, extremely strong survival capabilities, and can upgrade themselves autonomously.

Gameplay Introduction: The team leader leads the squad to defeat the incoming creatures. The core gameplay is simple and easy to get into; players only need to meet the upgrade conditions and choose from 3 skills to upgrade at the right time, and release their ultimate moves at the right moment. Up to 30 pieces of equipment can be carried. If you want to create a playstyle that suits your personality, it requires a certain strategy, such as the critical hit school, slow school, projectile split school, tank school, quick attack school, and so on, with many options to choose from.

// Option A //

To download Mars Defense mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Mars Defense 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 Mars Defense 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 Mars Defense in HappyMod App.