Fireline2 is a tower defense game developed by Pi_game, available for Android devices. The game is free to download and play, and falls under the strategy game category.

The game is set in a world where demons from the plane of shadow have invaded and are threatening to destroy everything. Your objective is to recruit and synthesize soldiers to defend against the demon army. To do so, you must unlock more advanced fighters by merging soldiers. The game is super addictive and offers a familiar yet fresh and exciting experience for both merger fans and tower defense veterans.

The game has over a million downloads, and its orthodox sequel FireLine2: Devils Invasion is sure to keep players engaged for hours on end.