Here is the step-by-step process to get it running for free:
There might be a mobile port or remake of KKND: Krossfire available. You can try searching for "KKND: Krossfire mobile" or "KKND: Krossfire Android" to see if any such version exists. kknd krossfire download free for android
As the game installed, the bunker’s sirens began to wail. A Series 9 scouting party had picked up his signal. Here is the step-by-step process to get it